US 12,539,572 B2Granted

Method for positioning a workpiece and apparatus therefor

OwnerTorsten Hertinginventor

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Abstract

A method for precisely positioning a dental prosthesis workpiece in a machine tool includes creating an impression on a part positionable with respect to the tool in a known position in the tool, allowing arrangement of the workpiece precisely on the impression. The device includes a blank and a counter on which an impression is formed. The blank and the counter have key structures so they can be separated from each other and reproducibly reconnected in the same arrangement. An alternative on a computational basis is to provide the workpiece with referencing bodies, to determine their positions by scanning the workpiece, machining steps being generated based on the scan, and to scan the workpiece in a tool on a blank provided with key structures whose tool coordinates are known to determine the position of the workpiece in the tool both in terms of tool and construction system coordinates.

Claims8

Dependent claims

A method for positioning a workpiece in a numerically controlled machine tool, wherein

on a blank serving as a base, a duplicate comprising at least part of the workpiece is formed by the machine tool under the control of first data,
at least one key structure is formed in a positioning section of the blank,
a counter piece comprising an impression compound is placed on the base, the at least one key structure of the blank and a respective complementarily formed key structure on the counter piece being brought into engagement with each other so that the base and the counter piece are in a predetermined relative position to one another and a negative of the surface of the duplicate is formed in the impression compound, and the duplicate is removed from the base,
so that the counter piece can be reproducibly attached to the base in the same relative position and the workpiece can be reproducibly attached to the blank in a position corresponding to the first data by fitting the workpiece into the negative.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 17/278,092Filed 19 Sep 2019
Priority: EP 1819572020 Sep 2018
Published: US 2021/0347001 A111 Nov 2021
Granted: 3 Feb 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

B23Q 15/12
While the tool acts upon the workpiece: adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned…
G05B 19/401
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…
A61C 13/0004
Making bridge-work, inlays, implants or the like: computer-assisted sizing or machining of dental prostheses
A61C 13/0022
Making bridge-work, inlays, implants or the like: blanks or green, unfinished dental restoration parts