JP4298979B2 - Automatic lathe and centering position correction method of cutting tool in automatic lathe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic lathe and a center height position correcting method for correcting a center height position of a cutting tool in an automatic lathe.
[0002]
[Prior art]
In an automatic lathe equipped with a so-called NC function, the cutting edge position of a tool (tool) attached to the tool rest is made coincident with the axis of the main spindle (workpiece axis) in order to accurately machine the workpiece. Therefore, so-called center height correction is performed in which the cutting edge position of the cutting tool is corrected so as to match the axis of the main shaft. Conventionally, there are the following methods for correcting the center height position.
[0003]
First, as a first method, there is a center height position correcting method in an automatic lathe disclosed in JP-A-5-185304. In this center height correction method, a touch sensor is disposed at a predetermined position, and a cutting tool edge caused by movement of the X axis perpendicular to the center height direction and the Y axis along the center height direction is brought into contact with the touch sensor. Then, the Y coordinate to be contacted by the tool cutting edge of the main body and the touch sensor is compared with the actual Y coordinate, the Y axis correction value is calculated, and the center height position is corrected based on the Y axis correction value. .
[0004]
As a second method, there is a method using a bar having a known diameter. In this method, a rod having a known diameter is attached to the guide bush. In this state, the cutting tool is moved in the core height direction to make contact. The center height is corrected so that the cutting edge of the cutting tool is positioned on the axis of the spindle by controlling the tool so that the distance of one half of the diameter of the bar is moved from the position at which the cutting tool contacts the bar. be able to.
[0005]
Furthermore, as a third method, there is a method of test cutting a bar. In this method, a test bar is attached to a guide bush and a test cut is actually performed. At this time, the cutting edge position of the cutting tool is adjusted to a position where the cutting becomes shallow to some extent so that the bush (dough) remains on the surface of the test cut material. Then, the center height correction is performed so that the cutting edge of the cutting tool is positioned on the main axis by controlling the movement of the distance of one half of the diameter of the remaining bush from the cutting edge position where the test cut is performed. Can do.
[0006]
[Problems to be solved by the invention]
However, the conventional center height correction methods have the following problems.
[0007]
First, in the first method using the tool setter attached to the NC machine tool by the user, there is a problem that an attachment error is likely to occur in the tool setter and the measurement accuracy of the correction value is low. In addition, since it takes time to attach and detach the tool setter and make settings, there is a problem that it takes a long time to perform the measurement. In addition, a tool setter must be purchased separately from the machine body, which increases the cost.
[0008]
Next, in the second method, since the cutting tool is brought into contact with the workpiece in order to measure the distance, the cutting tool may cause chipping. When the cutting tool causes chipping, the cutting blade itself is damaged, and there is a problem that cutting cannot be performed properly. In addition, since a measurement is performed with a test work having a known diameter, it takes time.
[0009]
Furthermore, the third method has a problem that the material is wasted because the test cut is performed. Further, this method also has a problem that it takes time like the second method because it is necessary to test-cut the material separately from the workpiece processing.
[0010]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic lathe capable of improving workpiece machining accuracy, simplifying the entire apparatus, shortening the center height correction time, and eliminating the waste of the workpiece due to a test cut. It is in.
[0011]
[Means for Solving the Problems]
An automatic lathe according to the present invention that has solved the above problems includes a spindle that grips a workpiece and rotates the workpiece, a tool post that is position-controlled within a plane orthogonal to the axis of the spindle, and a position control of the tool post according to a machining program. A numerical control device, a tool holder provided on the tool post, a seating reference surface serving as a reference for seating a tool for cutting a workpiece, and a tool holder for holding the tool arranged in contact with the seating reference surface; When a reference tool having a reference shank width is attached to the tool holder, coordinate information of the tool rest in which the distance in the tool core height direction between the reference tool core height position and the workpiece axis is a predetermined value is obtained. and the reference position coordinates storage means for storing an input means for inputting the actually used as the used bytes shank width to the numerical controller, a shank width of the reference byte, input by the input means A shank width is, the reference position coordinates storage means coordinate information stored in, based on, in which and a center height position correcting means for correcting the center height position of use bytes.
In addition, an automatic lathe according to the present invention that solves the above problems includes a spindle that grips a workpiece and rotates the workpiece, a turret that is position-controlled in a plane orthogonal to the axis of the spindle, and a turret according to a machining program. A numerical control device that controls the position and a tool that is provided on the tool post and has a seating reference surface that serves as a reference when seating a tool for cutting a workpiece, and holds the tool that is placed in contact with the seating reference surface Coordinates of the tool post for which the distance between the center height position of the reference tool and the axis of the workpiece becomes the predetermined value when the holder and the reference tool having the reference shank width are attached to the tool holder. and the reference position coordinate storage means for storing information, input means for inputting a difference value between actual use is being used byte shank width and the reference byte of the shank width to the numerical controller, the input hand Based on the stored coordinate information input difference value and the reference position coordinates storage unit by, those comprising a center height position correcting means for correcting the center height position of use bytes.
[0012]
In the automatic lathe according to the present invention, since no tool setter or the like is provided, there is no decrease in accuracy due to an attachment error or the like, so that the accuracy can be improved and the device can be simplified. In the present invention, the coordinate information in which the distance between the center height position of the reference tool and the workpiece axis in the core height direction of the tool becomes a predetermined value is stored in the reference position coordinate storage means. For this reason, when adjusting the center height, the shank width of the tool used is measured, and the center height adjustment is performed based on the reference position coordinates only by inputting the shank width information corresponding to the measured value from the input means. This can contribute to shortening the adjustment time. Furthermore, since it is not necessary to perform a test cut or the like, it is possible to prevent waste of materials for performing the test cut. Here, the shank width information can be, for example, the measured shank width itself or a difference value between the measured shank width and the shank width of the reference byte.
[0013]
The reference position coordinate storage means preferably stores the coordinates of the seating reference plane on the coordinate axis along the center height direction.
[0014]
Thus, since the reference position coordinate storage means stores the coordinates of the seating reference plane on the coordinate axis along the center height direction, the amount of calculation processing in the numerical control device can be reduced. For this reason, seating position correction can be performed quickly.
[0015]
Furthermore, the tool center height position correcting method in the automatic lathe according to the present invention that solves the above-described problems includes a spindle that grips a workpiece and rotates the workpiece, and a tool post that is position-controlled within a plane orthogonal to the axis of the spindle. A numerical control device that controls the position of the tool post according to the machining program, and a seating reference surface that is provided on the tool post and serves as a reference for seating the cutting tool for cutting the workpiece, and is in contact with the seating reference surface A tool bit position correction method for an automatic lathe that corrects the center height position of the tool in an automatic lathe provided with a tool holder for holding the arranged tool, wherein the reference tool having a reference shank width is a tool holder When the tool is attached to the tool post, the tool post coordinate information is used to obtain the tool post coordinate information for which the distance in the tool center height direction between the reference tool center height position and the workpiece axis is the specified value.憶means may be stored in, actually used by the used byte shank width measured seeking shank width of bytes used to input by the input means a shank width of bytes used for numeric control apparatus, the reference byte and the shank width, a shank width of used bytes input by the input means, and the coordinate information stored in the reference position coordinates storage means, based on, for correcting the center height position of bytes used by the center height position correcting means Is.
In addition, the tool center height position correcting method in the automatic lathe according to the present invention that solves the above-described problems includes a spindle that grips a workpiece and rotates the workpiece, and a tool post that is position-controlled within a plane orthogonal to the axis of the spindle. A numerical control device that controls the position of the tool post according to the machining program, and a seating reference surface that is provided on the tool post and serves as a reference for seating the cutting tool for cutting the workpiece, and is in contact with the seating reference surface A tool bit position correction method for an automatic lathe that corrects the center height position of the tool in an automatic lathe provided with a tool holder for holding the arranged tool, wherein the reference tool having a reference shank width is a tool holder When the tool is attached to the tool bar, coordinate information of the tool post, where the distance between the reference tool center height position and the workpiece axis in the tool center height direction is a predetermined value, May be stored in the unit, actually used by the used byte shank width measured by obtaining a difference value between the shank width of the shank width and the reference byte bytes used, input means the difference value to the numerical control device Based on the difference value input by the input means and the coordinate information stored in the reference position coordinate storage means, the center height position correcting means corrects the center height position of the working bite.
[0016]
As described above, when the center height position correction according to the present invention is performed, a tool setter or the like is not provided, so that there is no decrease in accuracy due to an attachment error or the like, and therefore the accuracy can be improved. In the present invention, the coordinate information in which the distance between the center height position of the reference tool and the workpiece axis in the core height direction of the tool becomes a predetermined value is stored in the reference position coordinate storage means. For this reason, when adjusting the center height, the shank width of the tool used is measured, and the center height adjustment is performed based on the reference position coordinates only by inputting the shank width information corresponding to the measured value from the input means. This can contribute to shortening the adjustment time. Furthermore, since it is not necessary to perform a test cut or the like, it is possible to prevent waste of materials for performing the test cut.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the dimension ratio of drawing does not necessarily correspond with the thing of description.
[0018]
1 is a side view of an automatic lathe according to an embodiment of the present invention, FIG. 2 is a front view of a tool rest in the automatic lathe, and FIG. 3 is a plan view of the tool rest. As shown in FIG. 1, an automatic lathe 1 according to this embodiment includes a bed 2. On the bed 2, a headstock 3, a tool post 4, and a back attachment 5 are provided.
[0019]
A spindle 11 is installed on the spindle stock 3. A chuck 12 for holding a bar is provided on the tip end side of the main shaft 11, and holds a bar serving as a workpiece to be cut. A spindle (not shown) is arranged inside the main shaft 11, and the rod held by the chuck 12 is rotated around the axis (axis) by driving the spindle. In addition, a first guide rail 13 extending in the Z-axis direction is laid at a position where the headstock 3 is installed in the bed 2, and a first runner block 14 is attached to the lower surface of the headstock 3. ing. The first runner block 14 is fitted in the first guide rail 13 and drives the servo motor, so that the first runner block 14 moves along the first guide rail 13 and is installed on the head stock 3 and the head stock 3. The main shaft 11 to be moved moves in the Z-axis direction.
[0020]
As shown in FIGS. 2 to 4, the tool post 4 includes a gantry 21. The gantry 21 is mounted on the bed 2 in a fixed state, and the upper surface thereof is formed as an inclined surface that is inclined obliquely. A first dovetail groove 22 having a trapezoidal cross section is formed on the top surface of the gantry 21. The longitudinal direction of the first dovetail groove 22 extends along the Y-axis direction (horizontal direction). Further, a guide bush 23 is provided at a lower position of the gantry 21, and a main shaft passage portion through which the main shaft 11 passes is formed behind the guide bush 23 (left side in the drawing). The main shaft passage portion passes through the gantry 21 along the Z-axis direction, and the axis of the main shaft 11 passes through the central hole portion of the guide bush 23. Accordingly, the bar held by the main shaft 11 is guided to the guide bush 23 as it is. Each axis of the bar gripped by the main shaft 11 and the workpiece formed at the tip of the bar coincides with the axis of the main shaft 11. Further, the gantry 21 is provided with a servo motor (not shown). By driving the servo motor, a first base member 25 described later is moved in the Y-axis direction along the first dovetail groove 22.
[0021]
A first base member 25 serving as a Y-axis base is provided on the inclined surface of the gantry 21. The first base member 25 is provided with a first protrusion 26 having a trapezoidal cross section. The cross-sectional shape of the first protrusion 26 has a base angle that is the same as the base angle of the cross-sectional shape of the first dovetail groove 22, and the top and bottom sides are shorter than the cross-sectional shape of the first dovetail groove 22. There is no. A first protrusion 26 is inserted into the first dovetail groove 22, and a first spacer 27 is inserted in the space between the first dovetail groove 22 and the first protrusion 26. The first spacer 27 has a parallelogram-shaped cross section that fills the space between the first dovetail groove 22 and the first protrusion 26, and the first spacer 27 is between the first dovetail groove 22 and the first protrusion 26. The first protrusion 26 is fitted into the first dovetail groove 22 by inserting 27.
[0022]
The surface of the first base member 25 forms an XY plane that is orthogonal to the Z axis and extends along the vertical line. As shown in FIG. 4, a second dovetail groove 28 having a trapezoidal cross section is formed on the surface of the first base member 25. The second dovetail groove 28 has the same cross-sectional shape as that of the first dovetail groove 22 and is formed along the X-axis direction (vertical direction). Further, a servo motor 29 is provided above the first base member 25. The servo motor 29 moves a second base member 30 described later along the second dovetail groove 28 in the X-axis direction.
[0023]
A second base member 30 serving as an X-axis base is attached to the surface of the first base member 25, and the second base member 30 is provided with a second protrusion 31 having a trapezoidal cross section. The cross-sectional shape of the second protrusion 31 is the same as the cross-sectional shape of the first protrusion 26. A second protrusion 31 is inserted into the second dovetail groove 28, and a second spacer 32 is inserted between the second dovetail groove 28 and the second protrusion 31. The second spacer 32 has the same shape as the first spacer 27. Then, the second protrusion 31 is fitted into the second dovetail groove 28 by inserting the second spacer 32 between the second dovetail groove 28 and the second protrusion 31.
[0024]
In addition, a tool holder 33 is provided on the surface of the second base member 30. An appropriate number, six bytes B1 to B6 are attached to the tool holder 33 in the present embodiment. The tool holder 33 is provided with six tool attachment parts, and the left end surfaces of the tool attachment parts are formed as seating reference surfaces 33A to 33F. The cutting tools B1 to B6 attached to the cutting tool attachment part are attached in a state where their left surfaces are in contact with the seating reference surfaces 33A to 33F, respectively.
[0025]
Each of the cutting tools B1 to B6 is attached in a state of being in contact with the seating reference surfaces 33A to 33F, so that accurate positioning is performed. By using these cutting tools B1 to B6 while appropriately exchanging them, the workpiece at the tip end portion of the bar material held by the main shaft 11 and rotated and guided by the guide bush 23 is processed. In order to replace the cutting tools B1 to B6 used in the processing, the first base member 25 and the second base member 30 are appropriately moved. Furthermore, a tool holder 24 is provided at the center in the height direction of the second base member 30. The tool holder 24 is formed so as to protrude from the surface of the second base member 30, and holds a plurality of, in the present embodiment, four drilling tools D1 to D4. These drilling tools D1 to D4 are used for front drilling. A workpiece is processed and formed at the tip of the bar by using these cutting tools B1 to B6 and drilling tools D1 to D4.
[0026]
Further, the second base member 30 is provided with a breakage detecting device 34 for detecting breakage of the parting tool. The breakage detection device 34 has a plate-like drive plate 34A, and an upper end portion of a detection rod 34B which is a rod-like detector having a crank shape bent at an intermediate position is attached to the drive plate 34A. . Further, the breakage detection device 34 has a proximity sensor (not shown) and the like. When the first base member 25 and the second base member 30 are moved after the parting process is completed, the proximity sensor reacts when the detection bar 34B comes into contact with the workpiece, and the parting tool is damaged. Detect that
[0027]
The back attachment 5 includes an attachment main body 41, and a work holding portion 42 that holds the cut workpiece by cutting with the cutting tools B <b> 1 to B <b> 6 is provided in front of the attachment main body 41. Further, a second guide rail 43 is laid on the bed 2 at a position where the attachment main body 41 is provided, and a second runner block 44 is attached to the lower surface of the attachment main body 41. The second runner block 44 is fitted into the second guide rail 43 and drives the servo motor, so that the second runner block 44 moves along the second guide rail 43, and the attachment main body 41 and the work provided thereon The holding part 42 moves in the Z-axis direction.
[0028]
A chute 6 is provided between the back attachment 5 and the tool post 4. The workpiece processed by the cutting tools B1 to B6 and the drilling tools D1 to D4 provided on the tool post 4 is collected through the chute 6.
[0029]
Further, the servomotors and spindles for driving the base members 25 and 30 and the back attachment 5 in the headstock 3 and the tool rest 4 are connected to the numerical controller of the present invention and the controller 7 which is the center height position correcting means. Has been. The control device 7 controls the position of the tool post 4 in the XY plane according to a predetermined program, controls the servo motor, and controls the start and stop of rotation of the spindle and the like. Further, the control device 7 is provided with a storage means (memory) (not shown) which is a reference position coordinate storage means of the present invention. When a reference bit having a reference shank width is attached to the bit holder 33, In addition, coordinate information in which the center height position of the reference bit coincides with the axis of the workpiece, a machining program for machining the workpiece, and the like are stored.
[0030]
On the other hand, an input means 8 is connected to the control device 7. The user of the automatic lathe 1 can input the shape of the workpiece to be machined, the machining process, etc., as well as the shank width information of the used tool actually used. As this input means, for example, a touch panel type monitor screen or a keyboard can be used.
[0031]
The operation and action of the automatic lathe according to the present embodiment having the above configuration will be described.
[0032]
In the automatic lathe 1 according to the present embodiment, the workpiece is machined while moving the cutting tools B1 to B6 and the like attached to the cutting tool mounting positions of the tool post 4 on the XY plane according to a predetermined processing program. When moving the tool rest 4 in the Y-axis direction, the first base member 25 is moved, and when moving the tool rest 4 in the X-axis direction, the second base member 30 is moved.
[0033]
In machining the workpiece in this way, the tool post 4 is numerically controlled by the control device 7. However, the center height position correction is performed in order to accurately process the workpiece using the numerical control. This center height correction will be described. First, as shown in FIG. 5, in the automatic lathe 1, a reference tool BB, which is known at the time of shipment from the factory and has a reference shank width H, is attached in contact with the seating reference surface 33A of the tool holder 33. So that the distance in the center height direction (Y-axis direction) between the center height position and the axis of the main shaft (the axis of the workpiece formed at the tip of the bar attached to the main shaft) is a predetermined value, for example, 0 The position of the holder 33 is adjusted. In other words, the center height position when the reference tool BB having the reference shank width H is attached to the tool holder 33 is aligned with the axis of the main shaft. The distance between the center height direction position of the cutting edge of the reference bite BB and the axis of the spindle is stored in the memory of the control device 7 as coordinate information.
[0034]
The adjustment of the position of the tool holder 33 described above will be described in more detail.
[0035]
First, as shown in FIG. 5, a reference tool BB, which is known at the time of shipment from the factory and has a reference shank width H, is attached to the automatic lathe 1 in contact with the reference seating surface 33 </ b> A of the tool holder 33. In order to measure the center height position of the reference tool BB before and after this, the automatic lathe 1 further includes a tool setter (similar to the structure disclosed in JP-A-5-185304). I will let you. The cutting edge position detection sensor provided in the tool setter is naturally calibrated so that the position is known with respect to the machine coordinate system set by the control device 7. Next, in this state, the cutting edge of the reference cutting tool BB is brought into contact with the cutting edge position detection sensor so that the center height position of the reference cutting tool BB is a known position with respect to the machine coordinate system in the numerical controller. To measure the cutting edge position. Since the measurement is performed using the reference tool BB, the position of the seating reference surface 33A itself is known with respect to the machine coordinate system as a result of this measurement. However, the reference tool BB is mounted on the seating reference surface 33A and described above. Based on the center height position information obtained as coordinate values in the machine coordinate system thus obtained, a Y coordinate value in which the center height of the reference tool BB matches the main axis is obtained, and attribute information belonging to the tool holder 33 is obtained. The data is stored in a memory provided in the control device 7 for storage. When the detection position of the tool setter coincides with the main axis, the Y-axis coordinate value of the tool post 4 is stored in the memory as it is.
[0036]
This coordinate information is stored in a predetermined amount of information so that the user can directly correct and set using the same method as described above, for example, when it goes wrong due to secular changes that have been performed on the workpiece. It is recommended that the specification be updatable by executing the above operation.
[0037]
Then, when starting the processing of the workpiece, first, the shank width B of the used cutting tool BU that is attached to the cutting tool holder 33 and is actually used for processing the workpiece is measured. For the measurement of the shank width B of the used tool BU, a known method such as measurement using a dial meter can be used as appropriate. Thereafter, the difference between the shank width H of the reference byte BB and the shank width B of the used byte BU is calculated, and the difference value is input to the control device 7 by the input means 8. In the control device 7, the Y-axis coordinate value of the second base member 30 in the tool rest 4 is corrected based on the input difference value. For example, when the shank width B of the working bite BU is 0.5 mm shorter than the shank width H of the reference bite BB, the center height position is corrected to a position shifted by 0.5 mm to the right side in the Y-axis direction (+ Y side). On the contrary, when the shank width B of the working bite BU is 0.5 mm longer than the shank width H of the reference bite BB, the center height position is corrected at a position shifted 0.5 mm to the left side (−Y side) in the Y-axis direction. To do.
[0038]
The same center height correction is performed on each of the seating reference surfaces 33A to 33F by using the reference tool BB and the used tool BU, and the center height correction when the used tool BU (B1 to B6) is attached to each mounting portion is suitable. Can be done.
[0039]
Since the center height position is corrected in this way, it is not necessary to provide a tool setter, so that the apparatus can be prevented from becoming complicated. Further, since it is not necessary to bring the tool into contact with the workpiece when correcting the center height, it is possible to prevent the tool from being damaged by chipping. Furthermore, the center height can be corrected in a short time as a whole without wasting material for performing the test cut.
[0040]
The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above embodiment, when the reference tool is attached to the tool holder, the predetermined value of the distance in the core height direction between the center height position of the reference tool and the workpiece axis is set to 0. Can be set as appropriate. However, in order to lighten the calculation load, it is preferable to set this predetermined value to 0. Further, in the above embodiment, after measuring the shank width of the used byte, the difference between the measured value and the shank width of the reference byte is calculated and the difference value is input. May be input as it is, and the difference value may be calculated by the control device 7.
[0041]
【The invention's effect】
As described above, according to the present invention, there is provided an automatic lathe capable of improving the machining accuracy of a workpiece, simplifying the entire apparatus, shortening the center height correction time, and eliminating the waste of the workpiece due to a test cut. can do.
[Brief description of the drawings]
FIG. 1 is a side view of an automatic lathe according to an embodiment of the present invention.
FIG. 2 is a front view of a tool post in an automatic lathe.
FIG. 3 is a plan view of a tool post in an automatic lathe.
FIG. 4 is an enlarged front view of the vicinity of a tool holder in an automatic lathe.
FIG. 5 is an explanatory diagram illustrating a relationship between a reference byte and a used byte.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Automatic lathe, 2 ... Bed, 3 ... Main stand, 4 ... Tool post, 5 ... Back attachment, 6 ... Chute, 7 ... Control device, 8 ... Input means, 11 ... Main shaft, 12 ... Chuck, 13 ... First Guide rail, 14 ... 1st runner block, 21 ... Mount, 22 ... 1st dovetail groove, 23 ... Guide bush, 24 ... Tool holder, 25 ... 1st base member, 26 ... 1st protrusion part, 27 ... 1st spacer 28 ... 2nd dovetail groove, 29 ... Servo motor, 30 ... 2nd base member, 31 ... 2nd protrusion part, 32 ... 2nd spacer, 33 ... Bit holder, 33A-33F ... Seating reference plane, 34 ... Breakage detection Device 34A ... Drive plate 34B ... Detection rod 41 ... Attachment body 42 ... Workpiece holding part 43 ... Second guide rail 44 ... Second runner block B ... Shank width B1-B6 ... Bite, BB ... Standard buy , BU ... use bytes, D1~D4 ... drilling tool, H ... shank width.

Claims (4)

A spindle for gripping and rotating the workpiece;
A tool post whose position is controlled in a plane perpendicular to the axis of the main spindle;
A numerical control device for controlling the position of the tool post according to a machining program;
A tool holder that is provided on the tool post and has a seating reference surface that serves as a reference when seating a tool for cutting the workpiece, and holds the tool arranged in contact with the seating reference surface;
When the reference tool having a reference shank width is attached to the tool holder, the tool post in which the distance in the core height direction of the tool between the center height position of the reference tool and the axis of the workpiece becomes a predetermined value. Reference position coordinate storage means for storing the coordinate information of
Input means for inputting the shank width of the used byte actually used to the numerical controller;
A shank width of the reference byte, and the shank width inputted by the input means, the coordinate information stored in the reference position coordinates storage means, on the basis, lead to correct the center height position of the bytes used High position correction means;
An automatic lathe characterized by comprising. A spindle for gripping and rotating the workpiece;
A tool post whose position is controlled in a plane perpendicular to the axis of the main spindle;
A numerical control device for controlling the position of the tool post according to a machining program;
A tool holder that is provided on the tool post and has a seating reference surface that serves as a reference when seating a tool for cutting the workpiece, and holds the tool arranged in contact with the seating reference surface;
When the reference tool having a reference shank width is attached to the tool holder, the tool post in which the distance in the core height direction of the tool between the center height position of the reference tool and the axis of the workpiece becomes a predetermined value. Reference position coordinate storage means for storing the coordinate information of
Input means for inputting a difference value between the shank width of the used byte actually used and the shank width of the reference byte to the numerical controller;
Based on the difference value input by the input unit and the coordinate information stored in the reference position coordinate storage unit, a center height position correcting unit that corrects the center height position of the working tool;
An automatic lathe characterized by comprising. A spindle for gripping and rotating the workpiece;
A tool post whose position is controlled in a plane perpendicular to the axis of the main spindle;
A numerical control device for controlling the position of the tool post according to a machining program;
A tool holder that is provided on the tool post, has a seating reference surface that serves as a reference for seating a tool for cutting the workpiece, and holds the tool arranged in contact with the seating reference surface; A method for correcting the center height of a tool in an automatic lathe for correcting the center height of the tool in an automatic lathe,
When the reference tool having a reference shank width is attached to the tool holder, the tool post in which the distance in the core height direction of the tool between the center height position of the reference tool and the axis of the workpiece becomes a predetermined value. Is stored in the reference position coordinate storage means,
The shank width of the used bite is actually measured to obtain the shank width of the used bite, and the shank width of the used bite is input to the numerical controller by the input means,
A shank width of the reference byte, a shank width of the used bytes input by the input means, the coordinate information stored in the reference position coordinates storage means, on the basis, the use by the center height position correcting means A method for correcting the center position of a tool in an automatic lathe, wherein the center position of the tool is corrected. A spindle for gripping and rotating the workpiece;
A tool post whose position is controlled in a plane perpendicular to the axis of the main spindle;
A numerical control device for controlling the position of the tool post according to a machining program;
A tool holder that is provided on the tool post, has a seating reference surface that serves as a reference for seating a tool for cutting the workpiece, and holds the tool arranged in contact with the seating reference surface; A method for correcting the center height of a tool in an automatic lathe for correcting the center height of the tool in an automatic lathe,
When the reference tool having a reference shank width is attached to the tool holder, the tool post in which the distance in the core height direction of the tool between the center height position of the reference tool and the axis of the workpiece becomes a predetermined value. Is stored in the reference position coordinate storage means,
Measure the shank width of the used byte that is actually used to obtain the difference value between the shank width of the used byte and the shank width of the reference byte, and input the difference value to the numerical controller by the input means. ,
Based on the difference value input by the input unit and the coordinate information stored in the reference position coordinate storage unit, the core height position of the used bite is corrected by the core height position correcting unit. How to correct the center position of the tool on an automatic lathe.

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