Tool Deflection Compensation Across Curved and Straight Toolpaths

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Solution Overview

Problem

Existing methods for compensating tool deflection during machining, especially in peripheral operations with slender tools, result in inaccuracies due to non-straight sections, leading to significant dimensional deviations in the workpiece.

Innovation Solution

A method and machine tool that compensate for tool deflection by adjusting the relative speed and toolpath based on the ratio of tool radius to workpiece curvature and engagement length, using correction constants to ensure high-precision machining, particularly on straight, inner, and outer radii.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a uniform toolpath correction is applied for all workpiece sections, then the compensation method is simple to implement, but machining accuracy deteriorates at transitions between different geometries

Engineering Contradiction:

Improvecompensation method simplicityVSAvoidmachining accuracy at geometry transitions

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The control unit dynamically adapts the compensation method based on real-time detection of workpiece geometry. The system automatically transitions between toolpath correction and speed adjustment methods at geometry transitions, maintaining high accuracy without requiring complex manual configuration or multiple separate programs.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If tool deflection compensation is increased for slender tools, then machining accuracy is improved, but the complexity of determining appropriate compensation increases

Engineering Contradiction:

Improvemachining accuracyVSAvoidcompensation determination complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The control unit automatically determines the appropriate compensation amount based on programmed parameters (tool radius R1, workpiece radius R2, engagement length L). The system self-calculates the compensation values using the formulas provided, eliminating the need for manual trial-and-error determination or complex external measurement equipment.

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP4367561B1Method for compensating for deflection of a tool during machining of a workpiece, and machine tool therefor

Publication Date: 2026.01.28 P&L GMBH & CO KG

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AI summary

The invention relates to a method for compensating for deflection of a tool (2) during machining of a workpiece (4) using a machine tool (1), in which a control unit (10) of the machine tool (1) balances the compensation for the deflection differently in straight portions (41) and in curved portions (42) depending on a dimension E of engagement conditions in a contact point (6) between the tool (2) and the workpiece (4) , 43), a) on the basis of a ratio of a tool radius R1 and a radius of curvature R2 of the workpiece (4) according to the formula E = R1/R2 and/or b) on the basis of a ratio of a current engagement length L of the tool (2) in the circumferential direction on the workpiece (4) and an engagement length LG of the workpiece (2) in the circumferential direction on the workpiece (4) during machining of a straight portion (41) of the workpiece (4) according to the formula E = L/LG.