Cylindrical Fine Machining With Adaptive Feed Rate Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fine machining methods for cylindrical workpieces face challenges in achieving high precision and efficiency, particularly in maintaining consistent feed rates and preventing tool seizing, which leads to increased machining time and stress on the tool.
Innovation Solution
A method involving a fine machining tool with a conical portion and a shank portion, where the relative feed rate is continuously controlled based on process variables such as force and torque, allowing for adaptive feed rate adjustments to maintain optimal machining conditions without immediate reverse strokes, thereby reducing machining time and stress on the tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant feed rate is used during fine machining, then the machining process is simple to control, but the tool may seize on the workpiece leading to increased stress and machining time
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant feed rate to a dynamic adaptive feed rate that continuously adjusts based on real-time process variables. The feed rate is modulated according to measured forces and torques, allowing the system to respond to changing machining conditions and prevent tool seizing while maintaining operational simplicity through automated control.
Solution Approach 2:
The patent implements feedback control by measuring process variables (forces and torques) during machining and using this information to continuously adjust the feed rate. The control system compares actual process conditions with target values and modifies the feed rate accordingly, creating a closed-loop system that prevents tool seizing while maintaining ease of operation through automated adjustment.
2Reliability
If reverse strokes are frequently performed to prevent tool seizing, then tool stress is reduced, but machining time increases significantly
Solution Approach 1:
The patent applies preliminary action by proactively adjusting the feed rate based on predicted tool-workpiece interaction forces before seizing occurs. The control system uses real-time force and torque measurements to anticipate potential seizing conditions and reduces feed rate preemptively, eliminating the need for reverse strokes and maintaining continuous forward machining for improved productivity.
Solution Approach 2:
The patent maintains continuity of useful action by preventing tool seizing through adaptive feed rate control, thereby eliminating the need for interruptive reverse strokes. The machining process continues forward without interruption, maintaining productive action throughout the operation while still protecting the tool from excessive stress through continuous adaptive adjustment.
3Productivity
If high feed rates are used to increase productivity, then machining time is reduced, but the risk of tool seizing and loss of machining precision increases
Solution Approach 1:
The patent applies dynamics by implementing a dynamic feed rate that adapts to real-time machining conditions. The system maintains high feed rates for productivity when conditions permit, but automatically reduces feed rate when force and torque measurements indicate approaching seizing thresholds, thereby maintaining surface quality and dimensional precision without sacrificing overall machining rate.
Solution Approach 2:
The patent implements feedback control to balance productivity and precision by continuously measuring process variables and adjusting feed rate accordingly. The control system maintains high productivity through elevated feed rates while using real-time feedback from force and torque sensors to detect conditions that would compromise surface quality, automatically reducing feed rate to preserve manufacturing precision when needed.
Data Source
AI summary
The invention relates to a method for fine machining a cylindrical workpiece surface of a workpiece blank by means of a fine machining tool. Said method comprising the following steps: generating a relative rotational movement between a tool and a workpiece blank about a machining axis which is concentric to a cylindrical workpiece surface of the workpiece blank; generating a relative feed rate between the tool and the workpiece blank along the machining axis; detecting an actual value of a process variable, which is a function of a relative force between the tool and the workpiece blank and which can assume a plurality of process variable values; and continuously controlling the process variable by changing the relative feed rate in such a way that the more the relative feed rate changes, the more the actual value of the process variable deviates from a desired value of the process variable.