US 11,934,170 B2
Operating method of a numerical-control machine tool and detection device for implementing such method
Vladi Parpajola, Cadoneghe (IT)
Assigned to PARPAS S.P.A., Cadoneghe (IT)
Appl. No. 17/629,307
Filed by PARPAS S.p.A., Cadoneghe (IT)
PCT Filed Oct. 4, 2019, PCT No. PCT/IB2019/058468
§ 371(c)(1), (2) Date Jan. 21, 2022,
PCT Pub. No. WO2021/014201, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 102019000012681 (IT), filed on Jul. 23, 2019.
Prior Publication US 2022/0317652 A1, Oct. 6, 2022
Int. Cl. G05B 19/25 (2006.01); G01C 9/02 (2006.01)
CPC G05B 19/251 (2013.01) [G01C 9/02 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An operating method of a numerical-control machine tool that comprises: a tool-carrying head (2) which is provided with a tool-holder spindle (3) capable of accommodating tools for machining a piece; a movable supporting structure (4) that supports said tool-carrying head (2), and is provided with moving members (12, 15, 18) that are adapted to move the tool-carrying head (2) in a space surrounding the piece to be machined, during machining of the piece; and an electronic control device (5) that controls one or more moving members (12, 15, 18) of the movable supporting structure (4),
said operating method including, before machining of the piece, a calibrating procedure comprising the steps of:
fitting a detection device (100) into the tool-holder spindle (3) of the tool-carrying head (2), the detection device (100) being adapted to measure values of tilting of the detection device (100) relative to a predetermined reference inertial plane;
moving the tool-carrying head (2) in space so as to place said detection device (100) in succession in a multitude of control points spread on a first detection plane (P1) and to generate signals based on measurements taken in the multitude of control points, and
processing the signals arriving from the detection device (100) to create at least a first digital map (M1) that contains the tilting values of the detection device (100) relative to the reference inertial plane, in each of said control points; and
said operating method additionally comprising the step, during machining of the piece, of continuously correcting at least one of the spatial position and the orientation of a machining tool based on said first digital map (M1) that differ from ideal design values due to deformations associated with the movable supporting structure (4).