Method and relevant apparatus for controlling the machining of mechanical pieces
AssigneeMarposs Societa' Per Azioni
InventorMario Pozzetti
Life of this patent
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Abstract
The machining of mechanical pieces in a grinding machine is controlled depending on in-process and post-process measurements of the pieces. The post-process measurement is carried out by using the same in-process measurement means, with the provision of different zero references for the two types of measurements.
Claims8
An apparatus for controlling a machine tool, in particular a grinding machine, comprising measuring means for in-process and post-process checking a dimension of the pieces machined by the machine tool and control means for controlling the machine tool, the control means being connected to the measuring means for controlling the in-process checking and the post-process checking, the measuring means basically including a measuring head and an electronic amplifier connected to the measuring head and to the control means and adapted to provide a first measurement signal relating to the in-process checking and a second measurement signal relating to the post-process checking, the electronic amplifier defining distinct electronic references for the in-process and post-process checkings, respectively.
The apparatus according to claim wherein the measuring means comprise a slide adapted to perform three positioning steps of said measuring head for taking in-process and post-process measurements as well as the master piece measurements.
An apparatus for controlling a machine tool, in particular a grinding machine, comprising measuring means for in-process and post-process checking a dimension of pieces machined by the machine tool and control means for controlling the machine tool, the control means being connected to the measuring means for controlling the in-process checking and the post-process checking, the measuring means basically including a measuring head and an electronic amplifier connected to the measuring head and adapted to provide a first measurement signal relating to the in-process checking and a second measurement signal relating to the post-process checking, the electronic amplifier defining a first electronic reference for the in-process checking and a second electronic reference, distinct from the first reference, for the post-process checking of the same piece, the electronic amplifier comprising circuit means for correcting said first electronic reference on the basis of the second measurement signal.
An apparatus for controlling a machine tool, in particular a grinding machine machining pieces, with
- a master piece arranged in the machine;
- measuring means for both in-process and post-process checking a dimension of a piece, and for checking the master piece, comprising,
- a measuring head with feeler elements adapted for contacting the piece, and
- an electronic amplifier connected to the measuring head;
- and
- control means, connected to the electronic amplifier for controlling the machine tool,
- wherein the electronic amplifier comprises:
- first, second and third reference means adapted to provide three distinct electronic references for the in-process and post-process checkings of the piece and checking of the master piece, respectively,
- comparator means connected to the measuring head and to the reference means and adapted to provide a first, a second and a third measurement signal relating to said in-process and post-process checkings of the piece, and checking of the master piece, respectively,
- a first processing unit, connected to the comparator means and to the control means, for receiving the first measurement signal and providing control signals to the control means;
- a second processing unit, connected to the comparator means, for receiving the second measurement signal, the second processing unit being adapted to provide a first correction signal to the first reference means;
- a third processing unit, connected to the comparator means, for receiving the third measurement signal, the third processing unit being adapted to provide a second correction signal to the first, second and third reference means.
Dependencies are inferred from the claim text.