Method for correcting tool deflection in machining a workpiece and machine tool therefor

The method and machine tool adjust tool deflections by modifying tool path and speed based on tool-workpiece ratios, addressing inaccuracies in circumferential machining, especially at inner and outer radii, to achieve high precision machining results.

JP7745666B2Active Publication Date: 2025-09-29P&L GMBH & CO KG
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Patent Information

Application Number
JP2023580858
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-07-07
Filing Date
2022-06-14
Publication Date
2025-09-29
Estimated Expiration
2042-06-14

AI Technical Summary

Technical Problem

Existing machining methods fail to accurately correct tool deflections during circumferential machining of workpieces, particularly with thin shafts, leading to significant dimensional deviations due to non-linear sections like outer and inner radii.

Method used

A method and machine tool that adjust tool deflection corrections based on the ratio of tool radius to workpiece curvature and engagement length, using control units to modify tool path and relative speed, accounting for straight, inner, and outer radii sections to achieve high precision machining.

Benefits of technology

Enables precise machining by compensating for tool deflections, ensuring accurate tool-path adjustments and relative speed changes, particularly in circumferential machining, enhancing machining accuracy and reducing deviations.

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Abstract

The invention relates to a method for correcting a deflection of a tool (2) in the machining of a workpiece (4) with a machine tool (1), in which a control (10) of the machine tool (1) adjusts the correction of the deflection differently in the straight portion (41) and in the curved portion (42, 43) depending on a dimension E of the engagement state at the contact point (6) between the tool (2) and the workpiece (4) based on a) the ratio between the tool radius R1 and the radius of curvature R2 of the workpiece (4) with reference to the formula E=R1 / R2 and / or b) the ratio between the current engagement length L of the tool (2) in the circumferential direction at the workpiece (4) and the engagement length LG of the tool (2) in the circumferential direction at the workpiece (4) in the machining of a straight portion (41) of the workpiece (4) with reference to the formula E=L / LG.
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