JP2012213814A - Automatic drill tip processing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damage caused by a collision between a drill and a grinding wheel in the detection of a relative position between the drill and the grinding wheel.SOLUTION: The automatic drill tip processing machine includes a main shaft 1 arranged freely movably in a predetermined direction and having a chuck holding the drill W being a processed material, the grinding wheel 4 arranged freely movably in the predetermined direction and giving machining for forming honing at the tip of the drill held by the main shaft, and a driving mechanism for moving the main shaft and the grinding wheel in the predetermined direction. The automatic drill tip processing machine further includes a measuring probe 3 arranged integrally with the main shaft and arranged in a positional relationship parallel to a drill mounting axis in the chuck, imaging cameras 20, 21 arranged in the moving range of the main shaft and imaging the drill held in the chuck and the measuring probe, and a control means obtaining the imaging information of the drill and the measuring probe from the imaging cameras and the driving information from the driving mechanism, and sending information for forming the honing at the tip of the drill by the grinding wheel to the driving mechanism based on the information.

Description

  The present invention relates to an automatic drill tip processing machine that forms a honing by automatically grinding a tip of a drill.

As a technique for forming a honing at the tip of the drill, Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique including a chamfering operation of a cutting blade performed in two stages. In this technique, in the first stage, the rotating grindstone is moved toward various positions on the cutting blade, the contact point is detected by the contact detector, and the electronic module controls and stops the grindstone to the initial position. Return to. In the second stage, the grindstone is controlled to follow a curve obtained by connecting the contact points recorded during the first stage.
Further, in Patent Document 2 below, when honing a drill, the cutting edge is covered with a covering material in a state where the cutting edge is exposed, and then the cutting edge is subjected to honing with a brush so that the rake face and the margin portion are provided. Is disclosed that intersects with an angle.

Special table 2009-502528 JP 2003-300109 A

    By the way, in the technique shown by patent document 1, since a grindstone contacts the cutting blade, the processing position is detected, and since a grindstone hits the front-end | tip of a drill with a considerable speed, a cutting blade is damaged with the grindstone which contacts. There was a fear. Further, the technique disclosed in Patent Document 2 does not show a detection means for detecting the positional relationship between the brush and the cutting edge, and there is a problem that honing cannot be formed with an accurate position or shape. It was.

  The present invention has been made in view of the above-described circumstances, and the positional relationship between a tip of a drill and a grindstone that performs processing for forming a honing on the tip of the drill is determined via an imaging camera and a measurement probe. An automatic drill tip processing machine capable of preventing damage due to collision between the tip of the drill and the grindstone when detecting the relative position between the tip of the drill and the grindstone is provided.

In order to solve the above problems, the present invention proposes the following means.
That is, in the automatic drill tip processing machine according to claim 1 of the present application, a spindle having a chuck that is provided so as to be movable in a predetermined direction and that holds a drill as a workpiece, and is provided to be movable in a predetermined direction. In an automatic drill tip processing machine comprising: a grindstone that performs processing for forming honing on a tip of a drill held by the main shaft; and a drive mechanism for moving the main shaft and the grindstone in a predetermined direction. A measurement probe arranged so as to move integrally with the spindle, a photography camera for photographing the drill and the measurement probe arranged within the movement range of the spindle and measurement probe and held by the chuck, and the photography The imaging information of the tip of the drill and the measuring probe from the camera and the driving information from the driving mechanism are acquired, and based on those information, the drill by the grindstone is used. Control means for emitting information for forming honing at the tip of the drill to the drive mechanism, and the control means indicates the position of the tip of the drill acquired based on the imaging information from the imaging camera. The relative position between the tip of the drill and the grindstone is indicated from the position information of the tip and the position information of the grindstone acquired by moving the measuring probe photographed by the photographing camera and bringing it into contact with the grindstone. Calculates work position information, and issues information for forming honing to the tip of the drill by the grindstone to the drive mechanism based on the work position information and shape information of the tip of the drill acquired by the photographing camera. And

According to the present invention, by moving the main shaft by the drive mechanism, first, the drill chucked by the main shaft is moved to the photographing camera, and the tip of the drill is imaged by the photographing camera. At this time, the position information of the tip of the drill and the shape information of the tip of the drill are acquired by the control means. Subsequently, by moving the main shaft by the drive mechanism, the measuring probe integrally installed on the main shaft is moved to the photographing camera, and the tip of the measuring probe is imaged by the photographing camera. The position information of the measurement probe at this time is acquired by the control means. Subsequently, the measuring probe is moved to the grindstone, and the position information of the grindstone is acquired by the control means via the measuring probe.
Then, the control means obtains work position information indicating a relative position between the tip of the drill and the grindstone by calculation from the obtained position information of the tip of the drill and the position information of the grindstone. Next, based on this work position information and the shape information of the tip of the drill acquired by the photographing camera, a drive signal is issued to the drive mechanism, and processing for forming honing at the tip of the drill is performed by a grindstone.

That is, in the automatic drill tip processing machine of the present invention, the position information of the tip of the drill and the position information of the grindstone for forming honing on the drill can be indirectly detected via the photographing camera and the measurement probe. At the time of the detection, it is possible to prevent damage caused by the collision between the drill and the grindstone, which has conventionally occurred.
Further, in the control means, the position information of the tip of the drill is obtained by the photographing camera and the position information of the grindstone is obtained by the photographing camera and the measurement probe, so that accurate position information of both of them can be obtained. On the other hand, honing can be processed with high accuracy.

In the automatic drill tip processing machine according to claim 2 of the present application, the photographing camera includes a front photographing camera that images the tip of the drill and the measurement probe from the front, and a side surface that images the tip of the drill from the side. And a photographing camera.
According to the present invention, since the front photographing camera that images the tip of the drill and the measurement probe from the front and the side photographing camera that images the tip of the drill from the side, accurate position information of the drill tip and the drill The shape information of the tip can be acquired accurately.

The automatic drill tip processing machine according to claim 3 of the present application is characterized in that a touch sensor that detects the tip position of the drill and the tip position of the measurement probe is provided around the photographing camera.
According to the present invention, in order to acquire the position information of the tip of the drill and the probe for measurement, their positions are acquired by the touch sensor.

In the automatic drill tip processing machine according to claim 4 of the present application, the main shaft moves in the x-axis direction parallel to the drill mounting axis and in the y-axis direction orthogonal to the x-axis direction in a horizontal plane, and the grindstone Moves along the z-axis direction orthogonal to the x-axis direction and the y-axis direction, respectively.
According to the present invention, since the main shaft is set to move in the xy plane and the grindstone is moved along the z-axis, the drill on the main shaft and the grindstone for machining the drill are based on these setting directions. The honing can be formed at the tip of the drill by a simple operation.

  In the automatic drill tip processing machine of the present invention, the positional relationship between the drill and the grindstone for forming the honing on the drill can be indirectly detected via the imaging camera and the measurement probe. It is possible to prevent damage caused by the collision between the drill and the grindstone that has occurred in the above.

  Further, in the control means, the position information of the tip of the drill is obtained by the photographing camera, and the position information of the grindstone is obtained by the photographing camera and the measuring probe, so that it is possible to obtain accurate position information of both of them. Honing can be processed with high accuracy. Further, since the position information of the grindstone is obtained by the measuring probe, the wear status of the grindstone can be grasped one by one, and in this respect also, the honing can be machined with high accuracy for the drill.

It is a top view showing a schematic structure of an automatic drill tip processing machine to which the present invention is applied. It is a block diagram which shows the automatic drill tip processing machine of FIG. It is a flowchart for performing camera calibration. It is a flowchart for performing a grindstone position measurement. It is a figure which shows the operation | movement 1 performed with the flowchart of FIG. It is a figure which shows the operation | movement 2 performed with the flowchart of FIG. It is a figure which shows the operation | movement 3 performed with the flowchart of FIG. It is a figure which shows the operation | movement 4 performed with the flowchart of FIG. It is a figure which shows the operation | movement 1 performed with the flowchart of FIG. It is a figure which shows the operation | movement 2 performed with the flowchart of FIG. It is a figure which shows the operation | movement 3 performed with the flowchart of FIG. It is a block diagram which shows the flow of data at the time of performing the flowchart of FIG.3 and FIG.4.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic configuration diagram (plan view) of an automatic drill tip processing machine to which the control system of the present invention is applied. In FIG. 1, reference numeral 1 denotes a main shaft.
The main shaft 1 is provided so as to be movable in a predetermined direction (in this example, the xy-axis direction: the x-axis direction parallel to the drill attachment axis 1A, the y-axis direction orthogonal to the x-axis direction in the horizontal plane) and to be processed. A chuck 2 for holding a drill W (a test bar in this example) as a material is provided. In addition, a measuring probe 3 disposed so as to extend in parallel with the drill attachment axis 1 </ b> A in the chuck 2 is integrally provided at the base of the main shaft 1.

Further, within the movement range of the main shaft 1, the main shaft 1 is movably provided in a predetermined direction (in this example, the x-axis direction−the z-axis direction orthogonal to the y-axis direction (not shown in the drawing)) and is held by the main shaft 1. A grindstone 4 that performs processing for forming honing on the drill W is provided. The main shaft 1 and the grindstone 4 are moved in a predetermined direction by a drive mechanism 10 shown in FIG.
As shown in FIG. 2, the drive mechanism 10 includes an X-axis motor 11 and a motor driver 11A for moving the main shaft 1 in the X-axis direction, and a Y-axis motor 12 and a motor driver 12A for moving the main shaft 1 in the Y-axis direction. A Z-axis motor 13 and a motor driver 13A for moving the grindstone 4 in the Z-axis direction orthogonal to the XY axis, and a spindle motor 14 and a motor driver 14A for rotating the spindle 1 around the axis 1A ( Will be described later).

Within the movement range of the spindle 1, two photographing cameras 20 and 21 and a touch sensor 22 for photographing the drill W and the measurement probe 3 held by the chuck 2 are provided.
The photographing camera 20 is a front photographing camera that photographs the front end of the drill W held by the chuck 2 and the measurement probe 3 from the front, and the photographing camera 21 photographs the front end of the drill W held by the chuck 2 from the side. This is a side-view camera.
The touch sensor 22 is disposed in the vicinity of the photographing cameras 20 and 21 and functions to output an ON signal by being in contact with the drill W gripped by the chuck 2 and the measurement probe 3.

Next, referring to FIG. 2, the position information of the tip of the drill indicating the position of the tip of the drill W acquired based on the imaging information from the photographing cameras 20 and 21, and the measurement photographed by the photographing cameras 20 and 21. The positional relationship between the tip of the drill W and the grindstone 4 is obtained from the positional information of the grindstone 4 obtained by moving the probe for contact with the grindstone 4, and the imaging information obtained from the photographing cameras 20, 21 is acquired. The control means PC that acquires the shape information of the drill W will be described.
As shown in FIG. 2, the control means PC is a motion controller PC1 that drives the X to Z axis motors 11 to 13 and the spindle motor 14 in accordance with a preset program, and imaging data that captures imaging information from the imaging cameras 20 and 21. It comprises processing means PC2. In addition to the motors 11 to 14 described above, the control means PC also has an interface for driving the external device 18 including the illumination device actuators 16 and 17 and the magnet rotation motor that are irradiated when the photographing cameras 20 and 21 capture images. include.

Next, referring to FIGS. 3 and 4, a flowchart for performing camera calibration and a flowchart for measuring the position of the grindstone 4 will be described with reference to the operation diagrams of FIGS. 5 to 11 related thereto. explain.
Note that a program for executing these flowcharts is stored in the control means PC of FIG.

[Flowchart for camera calibration (see Fig. 3)]
[Step 1]
First, as shown in FIG. 5, a test bar instead of the drill W is gripped by the chuck 2 of the main shaft 1. This may be done manually or automatically based on pre-stored programming. The test bar is initially used, but the actual drill is held after the second time. Here, the following drill including the test bar is called.

[Step 2]
By driving the X-axis motor 11 and the Y-axis motor 12 of the drive mechanism 10 to move the main shaft 1, first, as shown in FIG. 6, the drill W chucked on the main shaft 1 contacts the touch sensor 22. The position information at this time is acquired by the control means PC. After that, based on this position information, the drill W chucked by the spindle 1 is moved to the front of the side photographing camera 21 through the drive mechanism 10 as shown in FIG.

[Steps 3-4]
After adjusting the illumination device actuator 16 to adjust the illumination position and brightness (step 3), as shown in FIG. 7, the side surface of the drill W chucked by the main shaft 1 is photographed by the side surface photographing camera 21 (step 4). ).

[Steps 5-6]
It is determined whether or not the shooting in step 4 is successful (step 5). If YES, the process proceeds to the next step 6. If NO, the flow is terminated and the process is started again. In step 6, the drill side image data (G1) imaged in step 4 is captured by the control means PC.

[Step 7]
By driving the X-axis motor 11 and the Y-axis motor 12 to move the main shaft 1, first, the drill W chucked by the main shaft 1 is moved to the front of the front photographing camera 20 as shown in FIG. 8.

[Steps 8-9]
After adjusting the illumination device actuator 15 to adjust the illumination position and brightness (step 8), as shown in FIG. 8, the front side of the drill W chucked by the spindle 1 is photographed by the front photographing camera 20 (step 9). ).

[Steps 10-11]
It is determined whether or not the shooting in step 8 has been successful (step 10). If YES, the process proceeds to the next step 11. If NO, this flow is terminated and the process is started again. In step 11, the drill front imaging data (G2) imaged in step 8 is captured by the control means PC, and this flowchart is terminated. When the flowchart of FIG. 3 ends, the process proceeds to the next flowchart of FIG.
In the above procedure, specifically, the position of the drill W is forcibly shifted and photographed at three points, and the position of the three points in the image are associated with the actual movement position and the actual direction, so that the world coordinates Map pixel coordinates. Thereby, coordinate mapping data of the tip of the drill W is obtained.

[Flowchart for grinding wheel position measurement (see FIG. 4)]
[Step 20]
By driving the X-axis motor 11 and the Y-axis motor 12 of the drive mechanism 10 and moving the main shaft 1, the measurement probe 3 installed integrally with the main shaft 1 is applied to the touch sensor 22 as shown in FIG. 9. The position information at this time is acquired by the control means PC. Then, in the control means PC, based on the position information of the measurement probe 3 acquired based on the ON signal of the touch sensor 22, the measurement probe 3 supported by the main shaft 1 as shown in FIG. Move to the front of 20.

[Steps 21-22]
After adjusting the illumination device actuator 15 to adjust the illumination position and brightness (step 21), the measurement probe 3 supported by the spindle 1 is photographed by the front-facing camera 20 as shown in FIG. 10 (step 22). ).

[Steps 23-24]
It is determined whether or not the photographing in step 22 has been successful (step 23). If YES, the process proceeds to the next step 24. If NO, the present flow is terminated and the process is started again. In step 24, the measurement probe imaging data (G3) imaged in step 22 is captured by the control means PC.

[Steps 25-28]
By driving the X-axis motor 11 and the Y-axis motor 12 of the drive mechanism 10 and moving the main shaft 1 (step 25), the measuring probe 3 installed integrally with the main shaft 1 is moved as shown in FIG. The surface is brought into contact with the grindstone 4, the bottom surface position (step 26) and the edge position (step 27) of the grindstone 4 are measured, and detected from these measurement results and the measurement probe imaging data (G 3) acquired in step 24. From the position data of the measuring probe 3, the grindstone position data that is the origin position of the grindstone 4 including the bottom surface position and the edge position of the grindstone 4 is calculated and acquired (step 28).
That is, the camera origin acquired by the camera calibration of the measurement probe is associated with the grindstone origin.
[Steps 29-30]
It is determined whether or not the calculation in step 28 is successful (step 29). If YES, the process proceeds to the next step 30. If NO, the present flow is terminated and the process is started again.

Then, the position information (coordinate mapping data) A of the tip of the drill W gripped by the chuck 2 in the spindle 1 and the grindstone position measurement of FIG. 4 obtained in the flowchart for camera calibration of FIG. Based on the position information (grinding wheel position correction data) B of the grindstone 4 obtained by adding the correction in the probe calibration to the basic position data of the grindstone 4 acquired in the flowchart, the tip of the drill W gripped by the chuck 2 and Work position data (information) C which is relative position information of the grindstone 4 is calculated, and a predetermined command is given to the drive mechanism 10 based on this relative position information and the shape information of the tip of the drill W acquired by the photographing cameras 20 and 21. A signal is emitted, thereby causing the grindstone 4 to perform processing for forming a honing at the tip of the drill W.
As described above, the image of the drill W and the measurement probe 4 held by the chuck 2 of the main shaft 1 is photographed by the common photographing cameras 20 and 21. Therefore, based on the imaging data (G1 to G3), the tip of the drill W is measured. The relative position of the grindstone 4 can be accurately calculated, and in addition, the shape of the tip of the drill W is grasped by the common photographing cameras 20 and 21, so that the honing process to the drill W by the grindstone 4 is highly accurate. Can be performed.

  A block diagram summarizing the above description is shown in FIG. In such an automatic drill tip processing machine, the spindle 1 is moved by the drive mechanism 10 so that the drill W chucked by the spindle 1 is first brought into contact with the touch sensor 22, and the position information at this time is based on the position information. Next, the drill W is moved to a position facing the photographing camera 20. Such a movement is the same for the measurement probe 3.

  Further, in the automatic drill tip processing machine of the present invention, the relative positional relationship between the drill W and the grindstone 4 for forming honing on the drill W is indirectly determined via the imaging cameras 20 and 21 and the measurement probe 3. Therefore, when the relative position between the drill W and the grindstone 4 is detected, damage caused by the collision between the drill W and the grindstone 4 that has occurred in the past can be prevented.

  Further, the automatic drill tip processing machine of the present invention includes a front-view camera 20 that images the tip of the drill and the measurement probe from the front and a side-view camera 21 that images the tip of the drill from the side. Therefore, accurate position information of the tip of the drill and shape information of the tip of the drill can be acquired accurately and simply.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in the above embodiment, the driving mechanism 10 enables the main shaft 1 to move in the xy plane and the grindstone 4 to move along the z axis perpendicular to the xy plane. The moving direction can be set as appropriate.

  The present invention relates to an automatic drill tip processing machine for grinding a workpiece with a grindstone. According to the automatic drill tip processing machine of the present invention, the positional relationship between the drill and the grindstone for forming honing on the drill can be indirectly detected via the imaging camera and the measurement probe. Thus, it is possible to prevent damage caused by the collision between the drill and the grindstone, which has been generated conventionally.

DESCRIPTION OF SYMBOLS 1 Main shaft 1A Axis 2 Chuck 3 Measuring probe 4 Grinding stone 10 Drive mechanism 20 Imaging camera 21 Imaging camera 22 Touch sensor A Drill tip position information B Grinding wheel position data (information)
C Work position data (information)
W drill PC control means

Claims (4)

A main shaft having a chuck that is movably provided in a predetermined direction and that holds a drill as a workpiece, and a honing is formed at the tip of the drill that is movably provided in a predetermined direction and is held by the main shaft. In an automatic drill tip processing machine comprising a grindstone for processing, and a drive mechanism for moving the spindle and the grindstone in a predetermined direction,
A measuring probe arranged to move integrally with the main shaft;
An imaging camera that images the drill and the measurement probe that are arranged within the movement range of the spindle and the measurement probe and are gripped by the chuck;
The imaging information of the tip of the drill and the measuring probe from the imaging camera and the driving information from the driving mechanism are acquired, and information for forming honing at the tip of the drill by the grindstone is obtained based on the information. Control means for emitting to
The control means moves the measurement probe imaged by the imaging camera and contacts the grindstone by moving the position information of the drill tip indicating the position of the drill tip acquired based on the imaging information from the imaging camera. The work position information indicating the relative position between the tip of the drill and the grindstone is calculated from the position information of the grindstone acquired by the operation, and the work position information and the shape information of the tip of the drill acquired by the photographing camera are calculated. Based on the above, the automatic drill tip processing machine emits information for forming honing at the tip of the drill by the grindstone to the drive mechanism.   The said imaging | photography camera is provided with the front imaging | photography camera which images the front-end | tip of the said drill and the said probe for a measurement from the front, and the side photographic camera which images the front-end | tip of the said drill from the side. Automatic drill tip processing machine.   The automatic drill tip processing machine according to claim 1, further comprising a touch sensor that detects a tip position of the drill and a tip position of the measurement probe around the photographing camera.   The main shaft moves in the x-axis direction parallel to the drill attachment axis and in the y-axis direction orthogonal to the x-axis direction in a horizontal plane, and the grindstone is z-axis direction orthogonal to the x-axis direction and y-axis direction, respectively. The automatic drill tip processing machine according to any one of claims 1 to 3, wherein the automatic drill tip processing machine moves along the axis.

Images