JPH10286746A - Tool cutting edge measuring device for nc machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact tool cutting edge measuring device of high reliability in which high precision measurement can be performed in an NC machine tool. SOLUTION: A camera mounting box 8 on which a positioning camera and a measurement camera are fixed is provided on a head stock 1 of an NC machine tool to be movable to advance/retract in a main shaft axial center direction. This means that it advances to a measuring position in a processing area from the head stock 1 to be exposed in measuring a tool cutting edge, and that it retracts to be stored in a storage position in a cover at an upper part of the head stock 1 in non-measuring time. A light source 28 is provided in space in the depth of the head stock 1 on the head stock 1 as its base to be movable to advance/retract. This means that it advances from the upper part of the head stock 1 to a position to be exposed to face the camera in the processing area in measuring the tool cutting edge, and that it retracts to be stored to the storage position in the cover at the upper part of the head stock 1 in non-measuring time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the shape and position of a cutting edge of a tool in an NC machine tool.

[0002]

2. Description of the Related Art Since an NC machine tool has its operation and various functions set by a program, in order to perform precision machining, the position of a tool edge recognized by the NC machine tool and
It is necessary to match the actual position of the tool edge. Therefore, it is an important task to measure the deviation of the position of the actually attached tool edge from a predetermined reference position.

Conventionally, a contact-type tool presetter using a touch sensor or the like has been used to measure the above-mentioned positional deviation. However, if a contact-type measuring device is used, a tool such as a tool holder or a turret can be used. Peripheral members on the side,
There has been a problem that the measurement is limited or the measurement cannot be performed due to interference with peripheral members on the sensor side such as a sensor mount or a holder. In addition, in the case of a single crystal diamond tool, there is a problem that the cutting edge may be damaged, and it is not easy to measure the cutting edge with high accuracy.

A non-contact type tool presetter using a CCD camera as disclosed in JP-A-2-41856 and JP-A-4-256550 has been proposed to solve the problem of the contact type measuring device described above. Is being developed. Here, the CCD is a Charge Coupled Device.
e is an abbreviation for e, which means a charge-coupled device. The apparatus disclosed in Japanese Patent Application Laid-Open No. 2-41856 is one in which a CCD camera is installed in an NC machine tool main body.
The device disclosed in Japanese Patent No. 550 is provided with an external cover for an NC machine tool.
A D camera is installed.

[0005]

However, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 2-41856, the CCD camera is installed on the NC machine tool main body, and the relative position with respect to the workpiece is fixed. However, there is a problem that cutting powder, cutting oil, and the like due to processing adversely affect the measurement.

In the apparatus disclosed in Japanese Patent Application Laid-Open No. 4-256550, a CCD camera is mounted on an outer cover of an NC machine tool, and the outer cover has no rigidity (moves only by being pushed by a human). Since glass is interposed between the CCD camera and the tool, there is a problem that measurement accuracy is adversely affected.

An object of the present invention is to provide a compact and reliable tool edge measuring device capable of performing high-accuracy measurement in consideration of such a problem of a conventional tool edge measuring device in an NC machine tool. And

[0008]

According to the first aspect of the present invention, there is provided:
A tool edge measurement in an NC machine tool, comprising: a detection unit that detects an image of a tool edge shape and / or a blade edge position of a tool in a C machine tool; and a hidden drive unit that enables the detection unit to be hidden. Device.

According to a second aspect of the present invention, there is provided the tool cutting edge measuring apparatus for an NC machine tool according to the first aspect, wherein the detecting section comprises an imaging section and a light source section.

According to a third aspect of the present invention, the image pickup section comprises a CC
The tool edge measuring device for an NC machine tool according to claim 2, comprising a D camera.

According to a fourth aspect of the present invention, the covert driving unit includes:
The tool edge measuring device for an NC machine tool according to claim 2 or 3, wherein the image capturing unit and the light source unit are independently concealable units.

According to a fifth aspect of the present invention, the covert driving unit is
The tool edge measuring device for an NC machine tool according to any one of claims 1 to 4, wherein the detecting unit is means for allowing the detector to move between a measurement position and a storage position.

[0013] According to a sixth aspect of the present invention, the covert driving unit includes:
The apparatus according to claim 1, wherein the detection unit is configured to be able to move back and forth between a measurement position and a storage position, and to partition between the measurement position and the storage position when the detection unit is at the storage position. A tool edge measuring device for an NC machine tool according to any one of claims 1 to 4.

According to a seventh aspect of the present invention, the tool cutting edge of the NC machine tool according to claim 5 or 6, wherein the detection section is moved back and forth based on a headstock of the NC machine tool body. It is a measuring device.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall plan view of an NC machine tool equipped with a tool cutting edge measuring device according to an embodiment of the present invention (when the detecting section is at a retracted position), and FIG. 2 is a tool cutting edge according to an embodiment of the present invention. FIG. 3 is a perspective view showing a retracting mechanism of the CCD camera, FIG. 4 is a perspective view showing a mounting portion of the CCD camera, and FIG. FIG. 5 is a perspective view showing a mechanism for retracting the light source. FIG. 6 is a right side view of FIG. 2 showing the vicinity of the measurement position, and FIG. 2 is a view seen from the direction of the arrow in FIG. However, both FIGS. 1 and 2 are diagrams viewed from directly above in order to make it easy to understand only the retracting mechanism of the CCD camera on the headstock 1. In the following description, the CCD camera is simply referred to as a camera.

In FIGS. 1 to 6, a positioning camera A and a measurement camera B constitute an image pickup section of the present invention.
The light source 28 constitutes a light source section of the present invention. Further, the cylinder base 2, the rodless cylinder 3, the moving block 4, the arm 5, the plate 6, the measurement position stopper 7, the storage position stopper 9, and the camera retracting lid 10 serve as a covert driving unit of the present invention relating to the imaging unit. The cylinder base 21, the plate 22, the mounting base 23, the cylinder 2
4. The piston rod 25, the light source retracting lid 29, and its driving source (not shown) constitute a hidden driving unit of the present invention relating to the light source unit.

Positioning camera A and measurement camera B
The camera mounting box 8 to which is fixed is provided on the headstock 1 of the NC machine tool via a later-described retracting mechanism, and is capable of retracting and moving in the spindle axis direction. That is, when the tool edge is measured, the tool is advanced and exposed from the upper portion of the headstock 1 to a measurement position in the machining area (the state shown in FIG. 2), and is retracted and stored at the storage position in the cover above the headstock when not measuring (the state shown in FIG. 1). ).

The light source 28 is provided in the space behind the headstock 1 with the headstock 1 as a base, and can move in and out. That is, when the tool edge is measured, the tool is forward-exposed from the upper portion of the headstock 1 to a position facing the camera in the machining area (the state shown in FIG. 2), and is retracted and stored at the storage position in the cover above the headstock during non-measurement (FIG. 1).

Next, the details of the retracting mechanism of the camera will be described with reference to FIG. FIG. 3 is a diagram illustrating the retracting mechanism of the camera of the tool cutting edge measuring device according to the present embodiment in the state of FIG. 1 (when the detection unit is at the storage position). For clarity, only the ends are shown. An L-shaped cylinder base 2 is fixed to an upper portion of the headstock 1, and a rodless cylinder 3 is installed on an inner surface thereof. A plate 6 fixed to an arm 5 is attached to a moving block 4 of the rodless cylinder 3, and a camera mounting box 8 is fixed to a tip of the arm 5. Further, a camera retracting lid 10 is fixed to the tip. Further, the camera mounting box 8 can be mounted and adjusted by removing the L-shaped lid 11.

Next, details of the camera mounting portion will be described with reference to FIG. FIG. 4 shows the L-shaped lid 1 in FIG.
FIG. 2 is a view of the camera mounting box 8 with the camera 1 removed.
The lower part of the camera mounting box 8 on one side of the bottom and side is released,
When the L-shaped lid 11 is attached, the cross section has an inverted U-shape. An L-shaped bracket 12 is fixed to the inner surface thereof, and an adjusting plate 13 is attached to the L-shaped bracket 12 so that the angle can be adjusted. A positioning camera A and a measurement camera B are fixed to the adjustment plate 13.

Next, details of the light source retracting mechanism will be described with reference to FIG.
This will be described with reference to FIG. FIG. 5 is a view showing the light source retracting mechanism of the tool edge measuring device of the present embodiment in the state of FIG. 1 (when the detection unit is at the storage position). An L-shaped cylinder base 21 is fixed to the back side surface of the headstock 1, and a cylinder 24 is provided on an upper surface of the head base 1 via a mounting base 23 integrated with the plate 22. The piston rod 25 is the cylinder 24
The light source table 2 has a light source 28 attached to a mounting bracket 26 at the tip thereof.
7 is fixed.

Next, the operation of this embodiment will be described.

The tool edge measuring apparatus of the present embodiment has two operation modes, a measurement mode and a storage mode.
The measurement mode is when the above-described detection unit is at the measurement position (FIG. 2).
The storage mode is a mode corresponding to when the above-described detection unit is at the storage position (the state in FIG. 1). Switching between the two modes can be automatically performed by a program, and can also be performed manually by operating an operation panel.

In the state shown in FIG. 1, when the mode is switched to the measurement mode, air is supplied from a drive source (not shown) to the rodless cylinder 3 and the cylinder 24, and the moving block 4 and the piston rod 25 advance, so that the camera A , B and the light source 28 are positioned at the measurement positions as shown in FIG. At this time, the light source retracting lid 29 is opened by a cylinder (not shown) in accordance with the advance of the light source 28. If the tool rest 32 is not located farthest from the main axis in a direction perpendicular to the main axis, the cameras A and B and the light source 28 do not move forward. On the camera side, the camera evacuation lid 10 is fixed to the camera mounting box 8, and the movement of the camera also serves as the opening / closing operation of the camera evacuation lid 10. The cameras A and B are positioned by the movement block 4 abutting on the measurement position stopper 7.

As shown in FIG. 6, the cameras A and B are attached to the camera mounting box 8 at an angle so as to be perpendicular to the blade surface of the tool T. This tilt angle is camera A,
The adjustment is performed when the adjustment plate 13 fixing B is attached to the L-shaped bracket 12 (see FIG. 4). In this state, the cutting edge P of the tool T indexed to the machining position by the turret 31
Is positioned between the cameras A and B and the light source 28, and the cutting edge P
The shape of the cutting edge and the position of the cutting edge are measured. The tool T is moved by moving the tool rest 32 by a drive source and a moving mechanism (not shown). The positioning is confirmed by the positioning camera A, and the actual measurement is performed by the measurement camera B.

In the state shown in FIG. 2, when the mode is switched to the storage mode, air is supplied from a drive source (not shown) to the rodless cylinder 3 and the cylinder 24, and the moving block 4 and the piston rod 25 are retracted. , B and the light source 28 are positioned at the storage positions as shown in FIG. At this time, the light source retracting lid 29 is closed by a cylinder (not shown) in accordance with the retreat of the light source 28. The cameras A and B are positioned by the movement block 4 abutting the storage position stopper 9.

As is apparent from the above description, in the present embodiment, the storage positions of the cameras A and B as the image pickup units and the storage positions of the light sources 28 as the light source unit are the same as the free space in the conventional NC machine tool. Since the device is installed in the former location, it is possible to eliminate the adverse effects of cutting chips, cutting oil, and the like due to processing, but it is unnecessary to add an extra space required for installing the apparatus.

Further, in this embodiment, the cameras A and B as the image pickup units and the light source 28 as the light source unit are independently driven by different driving sources. This is because the moving weights of the cameras A and B are reduced by making the cameras A and B that require repetition of the reciprocating operation and the light source 28 that does not require much accuracy with separate outgoing and outgoing mechanisms. This is to enable accurate positioning.

In the above-described embodiment, the detected image of the present invention has been described as the shape and position of the cutting edge P. However, the present invention is not limited to this. The blade shape may be recognized based on the blade selection information, and only the position information of the blade edge may be detected as an image.

In the above-described embodiment, the detection section of the present invention has been described as being composed of the CCD cameras A and B and the light source 28. However, the detection section is not limited to this, and is a means capable of capturing necessary image data. All you have to do is.

Further, in the above embodiment, the covert driving unit of the present invention enables the CCD cameras A and B and the light source 28 to independently move between the measurement position and the storage position, and the CCD cameras A and B. When the camera and the light source 28 are in the storage positions, the camera evacuation lid 10 and the light source evacuation lid 29 separate the measurement position and the storage position from each other. However, the present invention is not limited to this. Means that are fixed to the outside of the main unit and partitioned with a cover except during measurement, means that the storage position is arranged at a distance that does not adversely affect the measurement by cutting chips or cutting oil, etc., and the partition is omitted. What is necessary is just to be a means that can perform high-precision measurement while eliminating the adverse effects of cutting chips, cutting oil, and the like. Furthermore, although the CCD cameras A and B and the light source 28 are driven independently, the CCD cameras A and B may be driven out of the same drive source at the same time. Although the drive source means has been described as an air cylinder, the invention is not limited to this. For example, a hydraulic cylinder, a motor drive, etc.
What is necessary is just a means for ejecting the CD cameras A and B and the light source 28 respectively.

[0033]

As is apparent from the above description,
According to the first aspect of the present invention, it is possible to provide a highly reliable tool edge measuring device capable of performing high-accuracy measurement by eliminating an adverse effect due to cutting powder, cutting oil, or the like due to processing.

According to the fourth aspect of the present invention, in addition to the effects of the first aspect, it is possible to provide a tool cutting edge measuring apparatus which can reduce the moving weight of the image pickup unit and make it compact with high accuracy.

Further, according to the fifth and sixth aspects of the present invention, in addition to the effects of the first aspect, a compact tool edge measuring device can be provided.

The present invention according to claim 7 provides the invention according to claims 5 and 6.
In addition to the effects described above, a correction can be made between the headstock side and the tool post side in consideration of a relative error caused by thermal displacement or the like.

[Brief description of the drawings]

FIG. 1 is an overall plan view of an NC machine tool provided with a tool edge measuring device according to an embodiment of the present invention (when a detection unit is at a storage position).

FIG. 2 is an overall plan view of the NC machine tool provided with the tool edge measuring device according to the embodiment of the present invention (when the detecting unit is at a measuring position);

FIG. 3 is a perspective view showing a retractable mechanism of a CCD camera of the tool edge measuring device according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a mounting portion of a CCD camera of the tool edge measuring device according to the embodiment of the present invention.

FIG. 5 is a perspective view showing a light source retracting mechanism of the tool edge measuring device according to the embodiment of the present invention.

FIG. 6 is a right side view of FIG. 2 showing the vicinity of a measurement position.

[Explanation of symbols]

 Reference Signs List 1 headstock 2 cylinder base 3 rodless cylinder 4 moving block 5 arm 6 plate 7 measuring position stopper 8 camera mounting box 9 storage position stopper 10 camera retreat lid 11 L-lid 12 L-shaped bracket 13 adjustment plate 21 cylinder base 22 plate 23 Mounting Base 24 Cylinder 25 Piston Rod 26 Mounting Bracket 27 Light Source Table 28 Light Source 29 Light Source Evacuation Lid 31 Turret 32 Turret A Positioning Camera B Measurement Camera P Cutting Edge T Tool

Claims (7)

[Claims] 1. An NC machine comprising: a detection unit for detecting an image of a cutting edge shape and / or a cutting edge position of a tool in an NC machine tool; and a hidden driving unit for enabling the detection unit to be hidden. Tool edge measuring device for machines. 2. The tool cutting edge measuring device for an NC machine tool according to claim 1, wherein the detection unit includes an imaging unit and a light source unit. 3. An apparatus according to claim 2, wherein said image pickup section comprises a CCD camera. 4. The tool cutting edge in an NC machine tool according to claim 2, wherein the covert drive unit is means for enabling the image pickup unit and the light source unit to be hidden independently of each other. measuring device. 5. The NC according to claim 1, wherein the covert driving unit is means for allowing the detection unit to move between a measurement position and a storage position. Tool edge measuring device for machine tools. 6. The hidden drive unit allows the detection unit to move back and forth between a measurement position and a storage position, and between the measurement position and the storage position when the detection unit is at the storage position. 5. A means for partitioning
A tool edge measuring device for an NC machine tool according to any one of the above. 7. The tool cutting edge measuring device for an NC machine tool according to claim 5, wherein the detection unit moves back and forth based on a headstock of the NC machine tool body.