JP2010044040A - Measurement apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measurement apparatus capable of obtaining high degree of accuracy in measurement, by protecting a position calibrating member from the adhesion of oil mist and dust and enabling measurements, even if it is positioned close to a processing machine. <P>SOLUTION: The measuring apparatus for measuring the shape of an object M to be inspected includes: a detection part (a shape sensor 20) for collecting shape information of the object to be inspected; a position-calibrating member (a reference sphere 30) for indicating reference position, when the detection part performs measurements; a protective means (a housing chamber 31 and an air pump 40) for separating the position calibrating member from its surrounding atmosphere; and a dust-collecting means 44 for purifying clean air. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a measuring apparatus for measuring a three-dimensional shape of a test object.

  As a measuring device for measuring the three-dimensional shape of a test object, for example, a moving table comprising an X stage that moves in one horizontal direction on the base and a Y stage that moves in the other horizontal direction perpendicular thereto is provided. A sensor head is provided on the Z stage that moves in the vertical direction, and a reflected light image of the measurement light reflected from the light source and the light source that emits measurement light toward the test object placed on the moving table on the sensor head. An apparatus incorporating a TV camera that acquires the above has been proposed (Patent Document 1).

  In the above apparatus, the test object is irradiated with the measurement light from the light source, the reflected light image of the measurement light reflected from the test object is observed with a television camera from a direction different from the direction in which the measurement light is irradiated, The three-dimensional shape of the test object is measured in a non-contact manner from the shape of the measurement light in the reflected light image, the position of the light source, and the position of the television camera.

In the measurement apparatus, a datum (position calibration member) serving as a reference for the measurement position is disposed at a location on the base that does not interfere with measurement, and calibration is performed by measuring the center position of the datum.
JP 11-125508 A

  This type of measuring device is usually installed in a place away from a lathe for machining a test object (machined product), for example, in a measurement chamber. After machining, the test object is once brought into the measurement room from the processing site, measured, and when the machining is necessary again from the measurement result, the test object is returned to the processing site.

  Moving the test object between the processing site and the measurement room in this way leads to a significant loss of time, and measurement is performed at the processing site of the test object (next to the lathe) from the viewpoint of improving productivity. It has been proposed to do.

  However, oil mist, dust, and the like are also floating at the processing site, and even if a shielding object is installed around the measurement device, the oil mist, dust, etc. may adhere to the datum that is the heart of the measurement device.

  If oil mist or dust adheres to the datum, the center position of the datum is incorrectly measured during calibration by the amount of dust or oil mist thickness, and correct calibration cannot be performed. There is a problem that accuracy cannot be obtained.

  The present invention has been made in view of the above circumstances, and provides a measuring apparatus that can obtain a measurement accuracy by protecting a position calibration member from adhesion of oil mist, dust, and the like, and can perform measurement even near a processing machine. With the goal.

  The measuring device according to claim 1 of the present invention that achieves the above object is a measuring device that measures the shape of a test object, and includes a detection unit that collects shape information of the test object, A position calibration member indicating a reference position at the time of measurement, and protection means for separating the position calibration member from the surrounding atmosphere. The protection means is an ambient atmosphere of the protection means via dust collection means. The gas flow forming means separates the position calibration member from the atmosphere by flowing a gas having less impurities.

  The measuring apparatus according to claim 2 of the present invention is a measuring apparatus that measures the shape of the test object, and includes a detection unit that collects shape information of the test object, and a reference position at the time of measurement of the detection unit And a protective means for separating the position calibration member from the surrounding atmosphere, and the protective means is an openable / closable cover member that covers the position calibration member and is separated from the surrounding atmosphere. And a gas supply unit for supplying a gas having less impurities than the atmosphere in which the measuring device is installed inside the cover member via a dust collecting means.

  The measuring apparatus according to claim 3 of the present invention is the measuring apparatus according to claim 1 or 2, wherein the dust collecting means charges the impurities contained in the gas supplied to the gas flow forming means. And a dust collection mechanism charged to a polarity opposite to the charged polarity of the charged impurities, and the charged impurities are attracted by the dust collection mechanism.

  The measuring apparatus according to claim 4 of the present invention is the measuring apparatus according to claim 3, wherein the charging mechanism sprays the charged inert gas onto impurities contained in the gas supplied to the gas flow forming means. Alternatively, the impurity is charged by passing the gas containing the impurity through a charged inert gas atmosphere.

  The measurement apparatus according to claim 5 of the present invention is the measurement apparatus according to claim 4, wherein the dust collection mechanism has a mesh structure surrounding the flow path of the gas containing the charged impurities, and is drawn to the mesh. The charged inert gas and impurities are sucked and exhausted.

  According to the present invention, the position calibration member can be protected from adhesion of oil mist, dust, etc., and measurement accuracy can be obtained, and measurement can be performed near a processing machine.

  Hereinafter, a first embodiment of a measuring apparatus according to the present invention will be described with reference to FIGS. 1 to 5.

  The measuring device of the present invention is a device that measures the three-dimensional shape of a test object, and is installed, for example, near a lathe in an atmosphere in which dust and oil mist float.

  FIG. 1 is a schematic view showing an embodiment of the measuring apparatus of the present invention.

  The measuring device of the present embodiment includes a shape sensor 20 as a detection unit that collects shape information of the object M, a reference sphere 30 as a position calibration member that indicates a reference position at the time of measurement by the shape sensor 20, A measuring apparatus main body 10 equipped with a hangar 31 as a protection means (cover member) for separating the reference sphere 30 from the surrounding atmosphere is provided. In addition, this measuring device has a gas supply unit (gas flow formation) for supplying clean air (air having less impurities such as dust and oil mist than the atmosphere in which the measuring device is installed) to the hangar 31 and the shape sensor 20. Air pump 40 as means) and dust collecting means 44 for purifying gas supplied from the air pump 40 to the hangar 31 and the shape sensor 20 are provided.

  Clean air from the air pump 40 is supplied to the hangar 31 via the dust collecting means 44 and the air hose 41, and clean air is supplied to the shape sensor 20 from the air pump 40 via the dust collecting means 44 and the air hose 42. Supplied. A flow rate adjusting valve 43 is provided at the discharge port of the dust collecting means 44. The amount of clean air supplied to the storage 31 by the flow rate adjusting valve 43 via the air hose 41 and the shape sensor 20 via the air hose 42 are provided. The amount of clean air supplied to each can be adjusted independently.

  FIG. 5 is a cross-sectional view showing a schematic configuration of the dust collecting means 40. As shown in FIG. 5, clean air is supplied from the air pump 40 through the dust collecting means 44. The dust collecting means 44 removes impurities mixed in the air trapped by the air pump 40 and impurities generated in the air pump 40.

  The dust collecting means 44 is connected to the introduction port 449 through which the gas supplied from the air pump 40 is guided, the introduction passage 441 through which the gas introduced into the introduction port 449 passes, and the introduction passage 441. An ionized gas generation unit 448 that supplies an active gas to the introduction path 441; a mesh member 442 installed on the discharge port 450 side of the introduction path 441; an impurity recovery unit 443 that captures impurities drawn by the mesh member 442; And an exhaust port 444.

  The dust collecting means 44 has a charging mechanism for charging impurities contained in the air supplied from the air pump 40, and a dust collecting mechanism charged to a polarity opposite to the charging polarity of the charged impurities. Then, the charged impurities are attracted by the dust collecting mechanism.

  The charging mechanism includes an inert gas supply unit 447 and an ionized gas generation unit 448, and the inert gas charged by the ionization gas generation unit 448 is caused to flow along the gas supplied from the air pump 40 to the introduction path 441. Impurities are charged.

  The inert gas supply unit 447 supplies the inert gas to the ionized gas generation unit 448 at a constant pressure.

  The ionized gas generator 448 is provided with a discharge electrode (not shown). The ionized gas generator 448 is supplied with high frequency power from a high frequency power source 446. The ionized gas generator 448 is discharged inside by high frequency power to ionize the supplied inert gas. Then, the ionized inert gas is supplied to the introduction path 441. In this way, the charged inert gas is sprayed onto the impurities contained in the gas to charge the impurities.

  The dust collecting mechanism includes a mesh member 442 and an impurity recovery unit 443. The charged inert gas and impurities attracted by the mesh member 442 are sucked and exhausted, and the impurity recovery unit 443 separates impurities from the gas.

  The mesh member 442 is charged with a polarity opposite to that of the impurities charged by the DC power supply 445. The mesh member 442 is disposed so as to surround a gas flow path containing charged impurities. Further, since the exhaust port 444 is connected to a suction pump (not shown), the impurities and inert gas attracted by the mesh member 442 are collected by the impurity collection unit 443. The impurity recovery unit 443 includes a filter and a centrifuge, and separates the gas from the impurities and removes the impurities from the gas.

  On the other hand, the gas that has not been attracted by the mesh member 442 goes directly to the discharge port 50, and clean air with less impurities is supplied to the flow rate adjustment valve 43 connected to the discharge port 450.

  The air pump 40 has a measuring device main body 10 in order to minimize the transmission of vibrations generated during driving to the measuring device main body 10 and the shape sensor 20 and the reference sphere 30 provided in the measuring device main body 10. It is installed with a sufficient distance from the floor 11 on which is installed.

  The measurement apparatus main body 10 has a base 13 disposed on a vibration isolation table 12 installed on a floor 11, and the above-described reference sphere 30 and hangar 31, X stage 14, Y stage 15, and Z stage on the base 13. 16 is arranged.

  The vibration isolation table 12 is a device that absorbs most of the vibration generated by the air pump 40 and transmitted to the base 13 through the floor 11. Therefore, the measuring apparatus main body 10, the shape sensor 20, and the reference sphere 30 are hardly affected by vibration generated by the air pump 40.

  The X stage 14 is a mechanism for placing the specimen M, and translates the placed specimen M in the horizontal direction on the base 13 (see the arrow X direction in FIG. 1).

  The Y stage 15 has a horizontal portion 15a that moves in the other horizontal direction orthogonal to the X stage 14 on the base 13 (see the arrow Y direction in FIG. 1), and a vertical portion that stands vertically on the horizontal portion 15a. And a portion 15b. A Z stage 16 is movably supported on the vertical portion 15b.

  The Z stage 16 extends along the vertical portion 15b of the Y stage 15 in a direction perpendicular to the base 13 (see the arrow Z direction in FIG. 1), and extends parallel to the base 13 from the base 16a. Arm portion 16b. The shape sensor 20 is attached to the tip of the arm portion 16b so as to face the test object M.

  The shape sensor 20 is movable in the horizontal direction (arrow Y direction) and the vertical direction (arrow Z direction) with respect to the base 13 by the Y stage 15 and the Z stage 16. The shape sensor 20 is a device that measures the shape of the test object M by a light cutting method. As shown in FIG. 2, the shape sensor 20 projects the measurement light onto the test object M and is projected onto the test object M. And an imaging unit 22 for imaging the object M so that the position of the measured light can be understood. Clean air supplied from the air pump 40 is jetted around the outer periphery of the projection unit 21 and the imaging unit 22 via an air hose 42, respectively. The projection unit 21 and the imaging unit 22 are separated from the atmosphere in which the measuring device is installed by an air curtain formed by the supplied clean air flow, and impurities such as dust and oil mist contained in the atmosphere are separated from each unit. It is made not to adhere to the optical parts 21 and 22.

  The air hose 42 is made of elastic rubber and is freely bent and absorbs vibration generated by the air pump 40. Therefore, the vibration of the air pump 40 is not transmitted to the shape sensor 20 via the air hose 42.

  The position of the shape sensor 20 is a combined position of the positions of the X stage 14, the Y stage 15, and the Z stage 16. In addition, the irradiation position on the test object M of the measurement light is obtained from the image data output from the imaging unit 22, and measurement (not shown) is performed based on the position information of each stage and the radiation position of the measurement light from the image data. The outline shape position of the test object M in this measurement apparatus is output by the circuit. The shape data is converted into shape data based on the shape position data, and the shape data is output to a device such as a CAD.

  The reference sphere 30 is a member whose center position is measured by the shape sensor 20 in order to correct the positions of the X stage 14, the Y stage 15, the Z stage 16, and the shape sensor 20. 14, the Y stage 15, the Z stage 16, the shape sensor 20, and the like are fixed to places that do not get in the way. When the measurement device performs a calibration operation, the center position of the reference sphere 30 is measured.

  The hangar 31 is a device that isolates the reference sphere 30 from the atmosphere in which the measuring device is installed (a space in which dust, oil mist, etc. floats). As shown in FIGS. 3 and 4, the cover 32 and the cover 32 are provided. The door 33 is configured to be openable and closable, and an opening / closing device (not shown) that opens and closes the door 33. An air inlet 34 is provided in the cover 32, and an air hose 41 is connected to the air inlet 34. Clean air is supplied from the air pump 40 to the space inside the cover 32 via the air hose 41. Clean air is supplied from the air pump 40 via the dust collecting means 44 described above.

  An air filter 35 is provided at the intake port 34, and impurities such as dust and oil mist contained in clean air supplied from the air hose 41 are further removed and sent out to the space in the cover 32.

  The door 33 is a device that is connected to the cover 32 so as to be opened and closed by an opening / closing device. When the door 33 is closed, the reference sphere 30 is stored in the space inside the door 33 to isolate the reference sphere 30 from the atmosphere. The door 33 is provided with an exhaust port 36, and the exhaust port 36 is provided with an air filter 37. The air filter 37 prevents air in the atmosphere from flowing backward from the exhaust port 36 into the door 33. The air that once exits from the exhaust port 36 is mixed with the atmosphere in which the measuring device is installed, and contains impurities such as dust and oil mist. Further, when the air pump 40 is stopped due to a power failure or power OFF, the external atmosphere may flow back into the hangar 31 even when the hangar 31 is closed. The air filter 37 removes impurities such as dust and oil mist contained in the air even if the air flows back into the hangar 31 by any chance.

  The clean air sent out from the intake port 34 to the inside of the cover 32 passes around the reference sphere 30 and flows out from the exhaust port into the atmosphere through the air filter 37 provided in the exhaust port 36. Clean air forms an air layer free from dust and oil mist around the reference sphere 30.

  As shown in FIG. 4, when the door 33 is closed and the reference sphere 30 is stored in the hangar 31, the reference sphere 30 is exposed to clean air, so that dust and oil mist contained in the atmosphere adhere to it. There is nothing.

  As shown in FIG. 3, when the door 33 is open, the reference sphere 30 is exposed to a position where the shape sensor 20 can measure its shape. At this time, the clean air sent out from the intake port 34 to the cover passes through the periphery of the reference sphere 30 and is released into the atmosphere. Clean air forms an air layer free from dust and oil mist around the reference sphere 30.

  Thus, even when the reference sphere 30 is opened from the hangar 31, it is exposed to clean air, and the reference sphere 30 is protected from dust and oil mist contained in the surrounding atmosphere.

  By the way, when a power supply (not shown) is turned on, the measurement apparatus 10 performs a calibration operation to calibrate the measured position before measuring the shape of the test object M. In the calibration operation, the door 33 is opened by an opening / closing mechanism (not shown), and the shape sensor 20 measures at least the position of the required outer shape of the reference sphere 30 with this measuring device, and obtains the center position of the reference sphere 30 from the position. . At this time, since the reference sphere 30 is surrounded by a layer of clean air, no dust or oil mist adheres to the surface of the reference sphere 30 even though it is exposed to the atmosphere.

  Based on this center position, the position of the outer shape of the object M to be measured is corrected.

  Therefore, the position of the outer shape of the test object M can be corrected with high accuracy by calibration.

  When the calibration operation is completed, the door 33 is closed and the reference sphere 30 is protected. Even if the reference sphere 30 is isolated, the reference sphere 30 is exposed to clean air flowing in the hangar 31, so that no dust or oil mist adheres to the reference sphere 30 even after the calibration operation is completed. .

  As described above, according to the measurement apparatus of the present embodiment, dust and oil mist do not adhere to the reference sphere 30 while the measurement apparatus is operating, so that highly accurate calibration can be performed every time.

  When the power is turned off, the air pump 40 stops blowing clean air. However, since air filters 35 and 37 are respectively provided at the intake port 34 and the exhaust port 36 of the hangar 31, even if the atmosphere flows backward from the exhaust port 36 into the hangar 31, the air filter 37 causes dust or oil to flow. Since the mist flows into the hangar 31 after the mist is removed, no dust or oil mist adheres to the reference sphere 30.

  Since the dust and oil mist do not adhere to the reference sphere 30 even after the power is turned off in this way, even when the power is turned on and the calibration operation is performed again, the center position of the reference sphere 30 is highly accurate. Can be measured.

  In addition, the shape sensor 20 is separated from the atmosphere by the air curtain formed by clean air, so that the dust and oil mist contained in the atmosphere do not adhere, and the center position of the reference sphere 30 is determined. It is possible to measure with high accuracy and to measure the shape of the test object M with high accuracy.

  Next, a second embodiment according to the measurement apparatus of the present invention will be described. The present embodiment is different from the first embodiment in the arrangement position of the ionized gas generator 448 of the dust collecting means 44. Note that the same configuration as that of the first embodiment is the same as that of the first embodiment, and a description thereof will be omitted here.

  By the way, in the measuring apparatus of the present embodiment, the ionized gas generator 448 a provided in the dust collecting means 44 is disposed in the middle of the introduction path 441. FIG. 6 is a schematic configuration diagram of the dust collecting means 44 in the second embodiment.

  The inert gas supplied from the inert gas supply unit 447 forms a state in which the charged inert gas stays in the introduction path 441 by the ionized gas generation unit 448a disposed in the introduction path 441. . The impurity-containing gas supplied from the air pump 40 can be charged by passing through a charged inert gas atmosphere. After that, it is attracted by the mesh member 442 on the discharge port 450 side and is collected by the impurity recovery unit 443.

  The same ionized gas generator 448a as that of the first embodiment can be used.

  The present invention is not limited to the above embodiment. For example, the reference sphere 30 may not be stored in the hangar 31, but an air curtain may be formed around the reference sphere 30 with clean air so that the reference sphere 30 is separated from the atmosphere.

  Furthermore, the reference sphere 30 and the shape sensor 20 may be stored as the storage 31.

    Furthermore, as the shape sensor 20, in addition to collecting the shape information of the test object M in a non-contact manner, a measuring element (probe) that contacts the test object M and collects the shape information may be used.

It is the schematic which shows 1st Embodiment of the measuring device of this invention. It is the schematic of the shape sensor with which the measuring apparatus of FIG. 1 is equipped. It is explanatory drawing which shows the state at the time of use of the reference | standard sphere equipped with the measuring apparatus of FIG. It is explanatory drawing which shows the state at the time of non-use of the reference | standard sphere equipped with the measuring apparatus of FIG. It is the schematic sectional drawing which shows one Embodiment of the dust collection means with which the measuring apparatus of this invention is equipped. It is the schematic of the dust collection means used by 2nd Embodiment of the measuring device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Measurement apparatus main body 11 Floor 12 Vibration isolator 13 Base 14 X stage 15 Y stage 16 Z stage 20 Shape sensor 21 Projection unit 22 Imaging unit 30 Reference ball 31 Hangar 32 Cover 33 Door 34 Inlet 35, 37 Air filter 36 Exhaust 40 Air pump 44 Dust collection means

Claims (5)

A measuring device for measuring the shape of a test object,
A detection unit for collecting shape information of the test object;
A position calibration member indicating a reference position at the time of measurement of the detection unit;
Protective means for separating the position calibration member from its surrounding atmosphere,
The measuring means is a gas flow forming means for flowing a gas having less impurities than the ambient atmosphere of the protecting means through the dust collecting means to separate the position calibration member from the atmosphere. . A measuring device for measuring the shape of a test object,
A detection unit for collecting shape information of the test object;
A position calibration member indicating a reference position at the time of measurement of the detection unit;
Protective means for separating the position calibration member from its surrounding atmosphere,
The protective means is a cover member that can be opened and closed so as to cover the position calibration member and separate from the surrounding atmosphere, and has less impurities than the atmosphere in which the measuring device is installed inside the cover member via dust collection means. A measuring device comprising a gas supply unit for supplying gas. In the measuring device according to claim 1 or 2,
The dust collecting means is a charging mechanism for charging impurities contained in the gas supplied to the gas flow forming means;
A measuring device having a dust collection mechanism charged to a polarity opposite to the charged polarity of the charged impurities, and drawing the charged impurities by the dust collection mechanism. In the measuring device according to claim 3,
The charging mechanism is configured such that the charged inert gas is sprayed on the impurities contained in the gas supplied to the gas flow forming means, or the impurities containing gas are passed through the charged inert gas atmosphere. Measuring device characterized by charging In the measuring device according to claim 4,
The dust collecting mechanism has a mesh structure surrounding a gas flow path containing the charged impurities, and sucks and exhausts the charged inert gas and impurities attracted to the mesh.