Patent ID: 7231277
Filing Date: 2007-06-12
Classification: G01B

Abstract:
1. A surface shape determining device for a machining apparatus machining a work by using a tool mounted to a main spindle device which is numerically controlled to move in X, Y and Z axes, the surface shape determining device determining surface shape of a measured object and comprising: a fluid injecting unit supplying fluid from a fluid supply source to a nozzle mounted to the main spindle device and injecting the fluid from a front end of the nozzle to the measured object; a pressure measuring unit measuring pressure of the fluid of the fluid injecting unit; a nozzle movement control unit moving the nozzle together with the main spindle device, wherein the fluid injecting unit supplies fluid to the nozzle while the movement control unit moves the nozzle along an outer periphery of the measured object; a surface shape calculating unit calculating the surface shape of the measured object in accordance with change in pressure of the fluid measured by the pressure measuring unit; and an informing unit informing data of the surface shape calculated by the surface shape calculating unit, wherein the measured object is a jig arranged at a reference position which is another member of the work, the surface shape determining device further comprising: a Z axis initial coordinate value setting unit for setting a Z axis initial coordinate value at a Z axis initial coordinate position which is a position at which the main spindle device opposes a plane portion of the jig and is located a predetermined distance in a Z axis direction between the front end of the nozzle and the plane portion of the jig; an X axis initial coordinate value setting unit setting an X axis initial coordinate value at an X axis initial coordinate position which is a position at which the main spindle device opposes a first stepped portion formed at the jig and is located a predetermined distance in a Z axis direction between the front end of the nozzle and the first stepped portion; a Y axis initial coordinate value setting unit setting a Y axis initial coordinate value at a Y axis initial coordinate position which is a position at which the main spindle device opposes a second stepped portion formed at the jig and is located a predetermined distance in a Z axis direction between the front end of the nozzle and the second stepped portion; a pre-working initial data storing unit storing pre-working initial data including respective relationships between coordinates of three axes and the pressure, which are measured by the pressure measuring unit such that the nozzle is moved so as to pass through the respective initial coordinate positions of the three axes and the fluid is injected to the jig before working the work; an after-working data storing unit storing after-working data including respective relationships between the coordinates of three axes and the pressure, which are measured by the pressure measuring unit such that the nozzle is moved to the respective initial coordinate positions of the three axes in series and the fluid is injected to the jig after working the work; a measured coordinate value generating unit generating respective measured coordinate values of three axes in accordance with the pre-working initial data and the after-working data; and a moving amount correcting unit correcting a moving amount of the main spindle device in the three axes of work data in accordance with the respective initial coordinate values and the respective measured coordinate values.