JPH09155693A - Y-axial direction knife edge measuring device of turning center - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the measuring of a knife edge center position in the Y-axial direction of a rotary tool in a simple operation, by providing a touch sensor having contacts in the +Y axial direction and the -Y axial direction. SOLUTION: A worker moves an end mill T2 relatively in the manual mode, it is abutted to a contact 12b in the +Y axial direction side, and he reads the machine coordinates value Y2 of a machine coordinates system at the contacting time, from a moving shaft controller. Then, the worker makes the end mill T2 abutted to a contact 12a in the -Y axial direction in the manual mode, and reads the coordinates value Y1 in the -Y axial direction side from the moving shaft controller. The rotation center position error found from the coordinates values Y1 and Y2 and set data Y01 and Y02 , and the diameter are stored in a memory area of a tool offset memory, corresponding to the correcting number of the end mill T2 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a turning center in which a rotary tool such as an end mill can be attached to a tool post, measures the cutting edge for matching the rotary center position of the rotary tool with the rotary center position for turning. Regarding the device,
Especially when performing keyway machining with an end mill that has a rotation center in the X-axis direction, in order to improve the accuracy of keyway distribution, the Y-axis of the turning center is determined in order to determine the Y-axis rotation center position of the end mill before machining. The present invention relates to a directional edge measuring device.

[0002]

2. Description of the Related Art Turning centers mainly for turning a workpiece (workpiece) and mounting a rotary tool on a tool rest are capable of performing various kinds of turning and machining. In such a turning center, a keyway may be processed by a rotary tool (for example, an end mill). FIG. 6 is an explanatory view of a case where a key groove is formed in such a turning center as viewed from a spindle axis direction (Z axis direction) in which a workpiece is gripped and rotated. A work W is gripped by a chuck at the end of the main shaft of the turning center. An end mill T is mounted on the side of the tool rest TR with its axis of rotation oriented in the X-axis direction (the direction orthogonal to the main axis, which is the direction in which the turning tool is cut). The key groove machining is based on the NC machining program, and moves the end mill T and the workpiece W in the X, Z, and C axis directions (Y axis direction if the turning center is movable in the X axis direction and the Y axis direction orthogonal to the Z axis direction). (Including also). By the way, the key groove K is determined from the width dimension, the depth dimension, and the longitudinal dimension, and the NC machining program is created based on this machining shape. However, the center of rotation of the end mill T actually mounted is the turret TR. There may be a case where the position is slightly different from the reference position. In such a case, there is a problem that the processing accuracy (key groove distribution accuracy, etc.) is not obtained. On the other hand, in the case of a turning tool (fixed tool), the difference between the reference blade edge position in the X-axis direction and Z-axis direction and the blade edge position of the actually mounted tool is obtained before machining, and the tool offset value is stored in the tool offset memory. It is stored as (correction data) and the tool is corrected by the correction data at the time of processing. The present applicant has proposed a technique relating to a tool presetter capable of easily obtaining such correction data in Japanese Patent Publication No. 63-4.
It is disclosed in Japanese Patent No. 7579.

[0003]

[Problems to be solved by the invention]
The tool presetter disclosed in Japanese Patent Laid-Open No. -47579 only measures the blade edge position in the biaxial directions of the X and Z axes, and does not measure the blade edge position in the Y axis direction. However, the center of rotation of the end mill T attached to the tool rest TR may have a small amount of error δ _Y with respect to the reference center position of the tool rest. Workpiece W due to this error δ _Y
In some cases, it may not fall within the tolerance range of machining accuracy. Therefore, at the time of processing the key groove, the operator must manually measure the processing accuracy of the key groove K after processing, and if it is out of the tolerance range, correction input or blade edge correction work must be performed, resulting in poor work efficiency. There was a problem. SUMMARY OF THE INVENTION It is an object of the present invention to provide a Y-axis direction blade edge measuring device for a turning center, which enables simple measurement of the blade edge center position in the Y-axis direction of a rotary tool such as an end mill mounted on a tool rest such as a turning center. .

[0004]

In order to solve the above-mentioned problems, the present invention relates to a Z-axis direction which is a spindle axis direction, and a moving direction which is orthogonal to the Z-axis direction and which is used for radial cutting of a turning tool. It was attached to the tool post in a turning center where the tool post could be moved and positioned relative to the headstock in the X-axis direction, the Y-axis direction which is a direction orthogonal to the X-axis direction and the Z-axis direction. A cutting edge measuring device for measuring a cutting edge position of a tool in a Y-axis direction, wherein a tool attached to the tool post moves in the Y-axis direction, and a contact signal is sent when a cutting edge portion of the tool comes into contact with the tool. As described above, the touch sensor having a contact portion in the + Y axis direction and the −Y axis direction and the touch sensor movably provided on the headstock and provided on one side are provided at the blade tip measurement position and at the time of non-measurement. Withdrawal position The arm and the drive motor for driving the headstock or the tool rest in the Y-axis direction are moved and position-controlled, and the position data in the Y-axis direction when the contact signal is transmitted are provided. Moving axis control means to be read, a parameter memory in which a distance from the machine origin position in the Y-axis direction to the + Y-axis direction contact portion and the −Y-axis direction contact portion of the touch sensor is registered as setting data, and Position data in the Y-axis direction when contacting the + Y-axis direction contact portion, the -Y
A Y-axis cutting edge measurement calculation unit that calculates correction data of the cutting edge of the tool from the position data in the Y-axis direction when the axial contact portion is contacted and the setting data of the parameter memory, and this Y-axis cutting edge measurement calculation unit And a tool offset memory for storing the correction data calculated in step 1.

Further, the present invention is directed to the Z-axis direction which is the direction of the main axis, the X-axis direction which is orthogonal to the Z-axis direction and is the moving direction for the radial cutting of the turning tool, the X-axis direction and the Z-axis. In the Y-axis direction, which is the direction orthogonal to the direction,
A Y-axis direction blade tip measuring device for measuring a Y-axis direction blade edge position of a tool attached to the tool post in a turning center in which the tool post can be moved and positioned relative to the headstock. A touch sensor having a contact portion on at least one side in the axial direction and on the other side so that a tool mounted on the table moves and a contact signal is transmitted when the cutting edge portion of the tool comes into contact, Between the arm and the touch sensor, an arm that is movably provided on the headstock and that moves the touch sensor provided on one side between a blade edge measurement position and a retracted position during non-measurement, and the arm and the touch sensor. The contact portion of the touch sensor is provided so as to be rotatable between the Z-axis direction blade edge position measurement position or the X-axis direction blade edge position measurement position and the Y-axis direction blade edge position measurement position. The rotation means and the drive motor for driving the headstock or the tool rest in the Y-axis direction are moved and position-controlled, and position data in the movement direction when the contact signal is sent is read. The movement axis control means and the contact portion on one side of the touch sensor from the mechanical origin position in the Y-axis direction when the touch sensor is rotated by the rotation means to the Y-axis direction blade edge position measurement position, and the contact portion. A parameter memory in which the distance to the contact portion on the other side is registered as setting data, and the touch sensor is rotated by the rotation means to the Y-axis direction blade edge position measurement position, and the contact portion on the one side is rotated. From the position data when contacting, the position data when contacting the contact portion on the other side and the setting data of the parameter memory,
It has a Y-axis blade edge measurement calculation unit that calculates the correction data of the blade edge of the tool, and a tool offset memory that stores the correction data calculated by the Y-axis blade edge measurement calculation unit. The contact part and the contact part on the other side are rotated to the Y-axis direction blade edge position measurement position, and the + Z-axis direction contact part and the -Z-axis direction contact part, or the + X-axis direction contact part and the -X-axis direction contact part. And the + Y-axis direction contact part and the -Y-axis direction contact part.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram of the vicinity of a spindle and a tool rest in a front view of a turning center. FIG. 2 shows FIG.
FIG. 2 is a view taken in the direction of arrows II-II. FIG. 3 is a view taken along the line III-III in FIG. 1 and is an enlarged plan view of the sensor mounting member. FIG. 4 is a block diagram of a turning center control device equipped with the Y-axis direction blade edge measuring device of the present invention. Reference numeral 1 is a headstock that rotatably supports a spindle S to which a chuck C is attached via bearings (not shown), and 5 is a tool rest. In this tool rest 5, one or more turning tools (bites) T ₁ and rotary tools (for example, end mills) T ₂ can be attached to the turret 5a, and each tool can be rotationally indexed to a machining position. Has become. Further, the headstock 1 and the tool rest 5 are relatively positioned relative to each other in the main-axis axis direction of the main shaft S (Z-axis direction),
The X-axis direction (the vertical direction in this turning center), which is a cutting direction orthogonal to the Z-axis direction and moved when the turning tool T ₁ performs cutting in the radial direction, the Z-axis direction and the X-axis direction. It is movable in the Y-axis direction which is the orthogonal direction. A drive motor (for example, a servo motor, see FIG. 4) 38a for moving and positioning the headstock 1 or the tool rest 5 is controlled by the moving axis control unit 38. Further, the coordinate values of the headstock 1 and the tool rest 5 (machine coordinate system coordinate values, work coordinate system coordinate values, etc.) can be read when a contact signal described later is transmitted from the moving axis control unit 38 of the NC device. It is composed.

Reference numeral 2 denotes a touch sensor provided on the headstock 1 so as to be movable between a measurement position for measuring the cutting edge and a retracted position which is retracted from the machining area except when measuring the cutting edge. The touch sensor 2 has contact portions in four directions. For example, when the touch sensor 2 is rotated to the A position (at the position indicated by the chain double-dashed line in FIG. 3), the contact portions 13a in the + (plus) X-axis direction, − (minus). ) X-axis direction contact part 13b, + (plus) Z-axis direction contact part 12a,-(minus) Z-axis direction contact part 12
When the blade tip of the tool T ₁ comes into contact with the contact portion, a contact signal is sent out. Reference numeral 3 is a sensor mounting member for mounting the touch sensor 2. Reference numeral 4 is an arm, and 4a is a swing support portion fixed to the headstock 1. This arm 4
One end of the arm 4 is rotatably supported about the swing support portion 4a via a bearing in the swing support portion 4a.
The rotation of the arm 4 moves the sensor mounting member 3 including the touch sensor 2 between the measurement position and the retracted position. The other end of the arm 4 and the sensor mounting member 3 are formed to be rotatable by 90 degrees. That is, the shaft portion 3a of the sensor mounting member 3 is inserted into the rotation hole 4b of the arm 4, and the shaft portion 3a rotates in the rotation hole 4b. V-shaped notch holes 3e (see FIG. 3) are formed on the outer periphery of the shaft portion 3a at positions separated by a predetermined angle. A plunger type set screw 3c is screwed into the other end of the arm 4. The ball 3d, which is constantly pressed by a spring (not shown) at the tip of the plunger type set screw 3c, engages with the notch hole 3e to determine the rotational position. In addition, a hole or cutout 3f for passing an electric wire of the touch sensor 2 is formed in the center of the shaft portion 3a.
Are drilled. Sensor mounting member 3, notch hole 3e,
The plunger-type set screw 3c constitutes the rotating means, but the rotating means is not limited to this. It is sufficient that the touch sensor 2 can be rotated to a predetermined angle position. Then, when the sensor mounting member 3 is rotated to the A position side (the position indicated by the chain double-dashed line in FIG. 3), the contact portions of the touch sensor 2 are the contact portion 12a in the + Z axis direction and the contact portion 12b in the −Z axis direction. Become. On the other hand, when the sensor mounting member 3 is rotated by 90 degrees from the A position side to the B position side (solid line position in FIG. 3), the contact portions of the touch sensor 2 are the contact portions 12b and −Y in the + Y axis direction. It becomes the contact portion 12a in the axial direction.

Next, a turning center control device equipped with a Y-axis blade edge measuring device will be described with reference to FIG. 30
Is a central processing unit (CPU), 31 is a ROM that stores a control program, and 32 is a RAM that temporarily stores data that is being executed. 33, the distance from the machine origin position in the Y-axis direction to the + Y-axis direction contact portion 12b and the −Y-axis direction contact portion 12a of the touch sensor 2 is registered in advance as setting data (for example, Y _O1 , Y _{O2 in} FIG. 3). It is a parameter memory. Numeral 38 controls the movement and positioning of a servomotor 38a for driving the headstock 1 or the tool rest 5 in the Y-axis direction, and Y when a contact signal is transmitted.
It is a moving axis control unit (moving axis control unit) for reading position data in the axial direction. 34 is the contact portion 12b in the + Y-axis direction
From the position data in the Y-axis direction when touching, the position data in the Y-axis direction when touching the contact portion 12a in the -Y-axis direction, and the setting data in the parameter memory 33, the rotary tool T
2 is a Y-axis blade edge measurement / calculation unit that calculates the blade edge correction data. Reference numeral 35 is a tool offset memory that stores the correction data calculated by the Y-axis blade edge measurement calculation unit 34. Reference numeral 36 is a CRT which is a data display means, and 37 is a keyboard which is an input means for data and the like. In the case of this turning center, the machine origin position G _{Y in the} Y-axis direction
The center of the reference hole of the tool rest 5 located at is coincident with the center of the main axis in the Y-axis direction. And the center of the tool post reference hole is Y
Distance Y _O1 from the axial machine origin position G _Y to the contact portions 12b and 12a in the + Y axis direction and the −Y axis direction when the B position is rotated.
[(-) Numerical value] and Y _O2 are preset in the parameter memory 33 in the control device. In addition, the touch sensor 2
However, the contact position when it is rotated to the B position is also 63
Parameter memory 3 as known from Japanese Patent
3 is set in advance.

The operation of measuring the center position in the Y-axis direction of the rotary tool (end mill) T ₂ mounted on the tool rest 5 using this blade tip measuring device will be described with reference to FIGS. 1 to 4.
In the tool rest 5, the end mill T ₂ is indexed to the processing position. The operator swings the arm 4 in the horizontal direction and sets it at the measurement position. Next, the rotating means is rotated by 90 degrees so that the contact portions 12a and 12b are respectively −
The state is such that it can function as the Y-axis direction contact portion and the + Y-axis direction contact portion. The operator relatively moves the end mill T ₂ (that is, the tool rest 5) in the manual mode to bring it into contact with the contact portion 12b on the + Y axis direction side. Then a contact signal is sent out,
The machine coordinate value of the machine coordinate system at the time of contact is read from the moving axis control unit 38. That, + Y-axis direction side of the coordinate values from the machine origin G _Y when abutted against as shown in FIG. 3 (Y
₂ ) Read. Then, the operator brings the end mill T ₂ into contact with the contact portion 12a in the Y-axis direction in the manual mode, and reads the coordinate value (Y ₁ ) on the −Y-axis direction side from the moving axis control unit 38.

If the coordinate values Y ₁ and Y ₂ are read out, the coordinate values Y ₁ and Y ₂ and the setting data Y _O1 and
From Y _O2 , the mounting center position error (rotation center position error) δ _Y of the end mill T ₂ and the end mill diameter d can be calculated by the following equation. δ _Y = [(Y ₂ -Y _{O 2} )-(Y ₁ + Y _{O 1} )] / 2 d = (Y ₂ -Y _{O 2} -Y ₁ + Y _{O 1} ) where Y _O1 and Y ₁ are numerical values of (-) . The rotation center position error δ _Y and the diameter d thus obtained are stored in the memory area of the tool offset memory 35 corresponding to the correction number of this end mill T ₂ . Then, at the time of machining, it is read and the tool is corrected.

Another embodiment of the present invention will be described with reference to the drawings. FIG. 5 is an explanatory view of the vicinity of a spindle and a tool rest in a front view of a turning center according to another embodiment. 3 is an enlarged plan view of the touch sensor 21 portion.
Is substantially the same as the above, but is not provided with a rotating means. In addition,
Since the same parts as those in the first embodiment are designated by the same reference numerals, detailed description thereof will be omitted. A bracket 22 is provided upright on the upper part of the headstock 1, and an arm 41 is rotatably supported by a swing support portion 22a fixed to the bracket 22. That is, the rotary member 41a provided at one end of the arm 41 via the bearing in the swing support portion 22a.
By making the arm rotatable, the arm 41 becomes rotatable. 21 provided on one end side of the arm 41, when the cutting edge of the end mill T ₂ are in contact, the + Y-axis direction, and sends a contact signal of -Y axis direction + Y-axis direction contact part 21b, -
The touch sensor has a Y-axis direction contact portion 21a. The arm 41 allows the touch sensor 21 to move in the horizontal direction between the measurement position and the retracted position.
b and 21a can be moved to the measurement positions in the + Y axis direction and the −Y axis direction, and to the retracted position where they do not interfere with the tools T ₁ and T ₂ and the tool rest 5 when not measuring.

When performing a measuring operation with the Y-axis direction blade edge measuring apparatus according to another embodiment of the present invention, the arm 41 is horizontally swung to set the touch sensor 21 at the measuring position, and then the first position is set. The coordinate values Y ₁ , Y
₂ is read and the mounting center position error of the end mill T ₂ δ _Y
Ask as. In the configuration in which the arm is movably provided on the headstock 1, the arm is pivotally supported by the rocking support portion in both the first embodiment and the other embodiments, but the arm is moved to the headstock 1. The configuration provided freely is not limited to this. The touch sensor provided on one side of the arm may be moved between the blade tip measurement position and the retracted position when not measuring.

[0013]

As described above, according to the present invention,
Since the center position of the cutting edge in the Y-axis direction of a rotary tool such as an end mill mounted on the tool rest of the turning center can be measured with a simple operation, the difference between the actual measured tool center position and the reference tool center can be calculated. It is possible to store the tool correction value in the offset memory and perform the tool correction by the tool correction value during the processing. Therefore, there is no need for an operator to manually measure the machining accuracy of the workpiece to obtain a correction value and input the correction value into the tool offset memory as in the conventional case. Therefore, the machining of the turning center including the key groove machining can be automated, and the machining accuracy of the key groove machining can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of the vicinity of a spindle and a tool rest in a front view of a turning center.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a view taken along the line III-III in FIG. 1 and is an enlarged plan view of the sensor mounting member.

FIG. 4 is a block diagram of a turning center control device including the Y-axis direction blade edge measuring device of the present invention.

FIG. 5 is an explanatory diagram of the vicinity of a spindle and a tool rest in a front view of a turning center according to another embodiment.

FIG. 6 is an explanatory view of a case where a key groove is formed at a turning center or the like, as viewed from the center direction (Z-axis direction) of a spindle that grips and rotates a workpiece.

[Explanation of symbols]

 1 ... Headstock 2, 21 ... Touch sensor 3 ... Sensor mounting member 4, 41 ... Arm 5 ... Tool rest 33 ... Parameter memory 34 ... Y-axis blade tip measurement calculation unit 35 ... Tool offset memory 38 ... Moving axis control unit

Claims (2)

[Claims] 1. A Z-axis direction which is a spindle axis direction, an X-axis direction which is orthogonal to the Z-axis direction and which is a moving direction for radial cutting of a turning tool, the X-axis direction and the Z-axis direction. A cutting edge measuring device for measuring a Y-axis direction cutting edge position of a tool attached to the tool post in a turning center in which the tool post can be moved and positioned relative to the headstock in the Y-axis direction which is a direction The contact part in the + Y-axis direction and the -Y-axis direction so that the tool attached to the tool post moves in the Y-axis direction and sends a contact signal when the blade tip part of the tool contacts. A touch sensor having, and an arm that is movably provided on the headstock and that moves the touch sensor provided on one side between a blade edge measurement position and a retracted position during non-measurement, the headstock or The above A drive motor for driving the tool rest in the Y-axis direction is controlled for movement and positioning, and movement axis control means for reading position data in the Y-axis direction when the contact signal is transmitted, and Y-axis direction movement means. From the machine origin position to the + of the touch sensor
A parameter memory in which a distance to the Y-axis direction contact portion and the distance to the −Y-axis direction contact portion is registered as setting data, position data in the Y-axis direction when the + Y-axis direction contact portion is contacted, and −Y A Y-axis cutting edge measurement calculation unit that calculates correction data of the cutting edge of the tool from position data in the Y-axis direction when the axial contact portion is contacted and setting data of the parameter memory, and this Y-axis cutting edge measurement calculation unit A Y-axis direction blade edge measuring device for a turning center, comprising: a tool offset memory that stores the correction data calculated in step 1. 2. A Z-axis direction which is a spindle axis direction, an X-axis direction which is orthogonal to the Z-axis direction and which is a moving direction for radial cutting of a turning tool, an X-axis direction and an orthogonal direction to the Z-axis direction. In a turning center in which the tool rest can be moved and positioned relative to the headstock in the Y-axis direction, which is the direction in which the tool rests, the Y-axis direction for measuring the tip position of the tool attached to the tool rest in the Y-axis direction. A blade tip measuring device, wherein a tool attached to the tool post moves, and a contact signal is transmitted when the blade tip portion of the tool comes into contact, at least one side in the axial direction and the other side. A touch sensor having a contact portion on the headstock, an arm that is movably provided on the headstock and that moves the touch sensor provided on one side between a blade tip measurement position and a non-measurement retracted position, and A Between the touch panel and the touch sensor,
Rotating means for rotating the contact portion of the touch sensor between the Z-axis direction blade edge position measuring position or the X-axis direction blade edge position measuring position and the Y-axis direction blade edge position measuring position; A moving axis control means for moving and controlling a driving motor for driving the table or the tool rest in the Y-axis direction, and reading position data in the moving direction when the contact signal is transmitted; From the mechanical origin position in the Y-axis direction when the touch sensor is rotated by the moving means to the Y-axis direction blade edge position measurement position to the contact portion on the one side and the contact portion on the other side of the touch sensor. A parameter memory in which a distance is registered as setting data, and the rotating means rotates the touch sensor to the Y-axis direction blade edge position measurement position to contact the contact portion on one side. A Y-axis cutting edge measurement calculation unit that calculates correction data for the cutting edge of the tool from position data when the contact point on the other side, position data when the contact section on the other side is contacted, and setting data in the parameter memory; A tool offset memory that stores the correction data calculated by the cutting edge measurement calculating section, and rotates the contact section on one side and the contact section on the other side of the touch sensor to the Y axis direction blade edge position measurement position. Move, +
The Z-axis direction contact portion and the -Z axis direction contact portion, or the + X axis direction contact portion and the -X axis direction contact portion, and the + Y axis direction contact portion and the -Y axis direction contact portion can be commonly used. A cutting edge Y-axis measuring device for turning centers.