US 7,854,575 B2Granted

Displacement and deflection measuring device for main spindle in machine tool

AssigneeKomatsu Ntc Ltd.

InventorsTeruhiro Nishizaki, Yoshiharu Oyabe, Shiro Murai

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Abstract

A reference block 30 attached to a housing 20a is moved together with a main spindle 20 to a measurement start position A1, and the reference block 30 is so moved in a Z-axis direction as to across air injected from an air injection nozzle 25, so that a thermal displacement of the main spindle 20 is calculated based on change in pressure measured in the movement. The outer circumference of a tool mounted on the main spindle 20 is brought close to a leading end face of the air injection nozzle 25, and the air is injected to the outer circumference of the tool while rotating the tool at a predetermined position, and the air pressure is measured so that the rotational deflection of the tool is calculated based on the change in the measured pressure.

Claims14

Dependent claims

A displacement and deflection measurement device for a main spindle for a machine tool which comprises:

a main spindle that is moved by a numerical control and is mounted on a bed;
a tool which machines a work supported on a work supporting device and is mounted on the main spindle through a tool holder,
the displacement and deflection measurement device comprising:
a fluid injection nozzle mounted on the bed or the work supporting device;
a fluid supply source that supplies fluid to the fluid injection nozzle;
a measurement unit that measures pressure or flow rate of the fluid in a fluid passage defined from the fluid supply source to the fluid injection nozzle;
a thermal displacement calculating unit that calculates a thermal displacement of the main spindle on the basis of a change in the pressure or the flow rate of the fluids which is measured by:
moving the main spindle to a measurement position set for the thermal displacement measurement so that the reference face, which is formed on a housing of the main spindle, opposes to the fluid injection nozzle;
and
injecting the fluid from the fluid injection nozzle to a reference face formed on a housing of the main spindle;
and
a rotational deflection calculating unit that calculates a rotational deflection of the tool holder or the tool on the basis of a change in the pressure or the flow rate of the fluid, which is measured by:
moving the main spindle to a measurement position set for the rotational deflection measurement so that the tool holder or the tool opposes to the fluid injection nozzle;
and
injecting the fluid from the fluid injection nozzle to the tool holder or the tool of the main spindle which is in rotating state.

12 more elements

A displacement and deflection measurement device for a main spindle for a machine tool which comprises:

a main spindle that is moved by a numerical control and is mounted on a bed;
a tool which machines a work supported on a work supporting device and is mounted on the main spindle through a tool holder,
the displacement and deflection measurement device comprising:
a first fluid injection nozzle mounted on the bed or the work supporting device;
a second fluid injection nozzle mounted on the bed or the work supporting device;
a fluid supply source that supplies fluid to the first fluid injection nozzle and the second fluid injection nozzle, respectively;
first and second measurement units that measures pressures or flow rates of the fluid in fluid passages defined from the fluid supply source to the first and second fluid injection nozzles;
a thermal displacement calculating unit that calculates a thermal displacement of the main spindle, on the basis of the change in the pressure or the flow rate of the fluid, which is measured by injecting the fluid from the first fluid injection nozzle to a reference face formed on the housing of the main spindle while opposing the reference face to the first fluid injection nozzle;
and
a rotational deflection calculating unit that calculates a rotational deflection of the tool holder or tool on the basis of the change in the pressure or the flow rate of the fluid injected, which is measured by injecting the fluid from the second fluid injection nozzle to the tool holder or the tool of the main spindle while opposing the tool holder or the tool to the fluid injection nozzle.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/741,856Filed 30 Apr 2007
Priority: JP P. 2006-12683528 Apr 2006
Published: US 2007/0258781 A18 Nov 2007
Granted: 21 Dec 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

G05B 19/404
Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to…
B23Q 17/2233
For indicating or measuring existing or desired position of tool or work: for adjusting the tool relative to the workpiece
G01B 13/12
Measuring arrangements characterised by the use of fluids: for measuring distance or clearance between spaced objects or spaced apertures
G05B 2219/37409
Measurements: measure different pressure of fluid flow on contacting surface