Method for grinding small rotary cutting tools by a grinding machine

EP4598707A1Pending Publication Date: 2025-08-13ROLLOMATIC SA
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Patent Information

Application Number
EP2023783952
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-10-06
Filing Date
2023-09-28
Publication Date
2025-08-13

AI Technical Summary

Technical Problem

Conventional methods for grinding small rotary cutting tools with outer diameters less than 3mm, such as milling cutters and drills, face challenges in achieving high precision due to limitations in measuring the shape and position of abrasive wheels, leading to significant waste and prolonged production times.

Method used

A method involving the grinding machine's calibration through a calibration portion with distinct marks, allowing precise measurement of geometrical and position features of abrasive wheels using a laser imaging system, enabling accurate control of 3D coordinates for precise grinding operations.

Benefits of technology

This approach enables the production of cutting tools with outer diameters as small as 50 microns or 30-35 microns with reduced material waste and streamlined manufacturing, achieving high precision and efficiency in grinding small rotary cutting tools.

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Abstract

The present invention relates to a method for machining small rotary cutting tools (10) by a grinding machine, comprising: a) mounting a workpiece (10a) in a spindle (20) of the grinding machine; b) machining a calibration portion (CP) of the workpiece (10a) by performing one or a plurality of marks (M1, M2, M3, M4) on said workpiece with one abrasive wheel or with a corresponding plurality of abrasive wheels (W1, W2, W3, W4) of different shapes, wherein said one mark or each mark (M1, M2, M3, M4) comprises at least one geometrical feature (R1, R2, a1, a2, L) and two position features (D1, D2) corresponding respectively to a geometrical feature (R1w, R2w, a1w, a2w, Lw) and to 3D coordinates (D1w, D2w) of the corresponding abrasive wheel, in a X-Y-Z coordinate system of the grinding machine, that has ground the corresponding mark (M1, M2, M3, M4); c) performing measurements of said at least one geometrical feature (R1, R2, a1, a2, L) and said two position features (D1, D2) of said one mark or each mark (M1, M2, M3, M4) of the calibration portion (CP); d) generating a sequence of instructions based on said at least one geometrical feature and on said two position features of said one mark or each mark as measured under step c) to grind said workpiece (10a) to the final and desired shape of the cutting tool (10), and e) controlling the 3D coordinates of said one or more abrasive wheels (W1, W2, W3, W4) in said X-Y-Z coordinate system during grinding operations on the workpiece or on another workpiece according to said sequence of instructions to obtain said cutting tool (10).
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