JP4599942B2 - Lathe and blade edge position correction method - Google Patents

Description

  The present invention relates to a 1-spindle 2-turret lathe and a cutting edge position correcting method for correcting the cutting edge position of a tool after replacement when the tool is replaced due to tool life or the like.

  Conventionally, in order to keep the workpiece dimensions within tolerance from the first product after tool change, the tool sensor is lowered and lowered near the spindle, the tool tip position is measured by applying the tool tip to the sensor, and the correction is automatically entered. ing.

Further, there is a conventional one in which two turrets are provided for one spindle for shortening the cycle time. As a measuring device for the blade tip position of such a two-turret type lathe, a tool that can be interchangeably attached to two turrets arranged in the upper and lower directions, and one tool sensor is shared for workpiece measurement and tool edge measurement is proposed. (For example, Patent Document 1).
In addition to this, there has also been proposed a tool that considers thermal displacement correction when correcting the tool position after replacement (for example, Patent Document 2).
Japanese Patent Laid-Open No. 10-235539 Japanese Patent No. 2706420

In the case of the tool sensor that is lowered and lowered near the above main spindle, the position of the cutting edge is measured with reference to the position of the tool sensor. However, since the thermal rigidity of the arm of the tool sensor is actually weak, the position of the tool sensor is caused by thermal displacement. Shift. Therefore, highly accurate tool position correction is difficult.
The one disclosed in Patent Document 1 attaches a tool sensor to a turret. However, since the tool sensor is replaced with two turrets to be attached, an attachment error of the tool sensor occurs, and accurate measurement is difficult. . Moreover, the correction | amendment which considered the new and old tool at the time of tool replacement | exchange is not disclosed.
Although what is disclosed in Patent Document 2 takes thermal displacement into consideration, complicated control is required. There is also a problem with the location of the tool sensor.

The purpose is of this invention, a good cutting edge measurement accuracy in consideration of the thermal displacement is performed, correction corresponding to the size variation and mounting accuracy of the tool can accurately, first article good of after tool replacement can be reduced lathe Is to provide.
Still another object of the present invention is to perform highly accurate cutting edge measurement in consideration of thermal displacement, to perform accurate correction corresponding to tool dimensional variations and mounting accuracy, and to improve the quality of the original product after tool replacement. It is to provide a lathe edge position correction method.

The inventions of the lathe, the lathe comprising two turret (2A, 2B) on opposite sides of the spindle (1), attached to the tool sensor (11) to the turret (2A), lathe machining prior to the two turrets ( 2A, 2B) is moved to move the reference tool (20) held by the turret (2B) opposite to the turret (2A) to which the tool sensor (11) is attached. The pre-processing reference tool measurement control means (21) for measuring and storing the measurement results, and the first time for measuring the cutting edge position of the tool (9) used for the processing after the initial processing and storing the measurement results in the same manner as described above. Processing tool measurement control means (22) and post-replacement reference tool measurement control means (23) for measuring the position of the reference tool (20) and storing the measurement result after replacement of the tool of the turret (2B). , ½ of the difference between the measurement result of the reference tool measurement control means (21) before processing and the measurement result of the reference tool measurement control means (23) after replacement is defined as the thermal displacement correction amount (Δs), and the tool sensor ( 11) A tool measurement control means (24) after replacement for measuring the cutting edge position of the replaced tool (9) by moving the attached turret, and a value measured by the tool measurement control means (24) after replacement. When machining using the tool correction amount calculation means (25) for calculating the correction amount (Δx) from the difference between the values measured by the initial product measurement control means (22) and the tool (9) after the tool change. Tool correction means (27) for correcting the movement amount of the turret (2B) with the correction amount calculated by the tool correction amount calculation means (25) is provided.

In the case of this configuration, the post-replacement tool measurement control means (24) for measuring the position of the cutting edge of the tool (9) after replacement includes the measurement result obtained by measuring the reference tool (20) before machining, and the reference tool ( The turret (2A) to which the tool sensor (11) is attached is moved by setting 1/2 of the difference from the measurement result obtained by measuring 20) as the thermal displacement correction amount (Δs). Therefore, even if the tool is changed when the temperature rises due to the operation of the lathe, the measurement can be performed in a state where the thermal displacement is canceled, the dimensional variation of the replaced tool (9) with respect to the old tool, the variation of the mounting position, etc. Can be corrected with high accuracy. Therefore, the first product after tool replacement can be improved.
The reference tool (20) is a tool that is not used for processing, thus have good even measure only part of inability processing. In claim 3, the measurement-specific component is referred to as a “reference body”.

The lathe edge position correcting method of the present invention is a method for correcting the movement amount of the edge position of the tool (9) in a lathe provided with two turrets (2A, 2B) on both sides of the spindle (1). In this method, the tool sensor (11) is attached to the turret (2A), the reference tool (20) is attached to the other turret (2B), and correction is performed through the following steps.
That is, before machining the lathe, the turret (2A, 2B) is moved to measure the position of the reference tool (20) to measure the position of the reference tool (20).
An initial workpiece turning process (S2) of turning the initial workpiece with the tool (9) held by the turret (2B) on the reference tool (20) side;
An initial workpiece measurement process (S3) for measuring the turned initial workpiece with a measuring tool;
A confirmation process (S4) for confirming that the measured value of the first workpiece is within the allowable dimension;
An initial tool measurement step (S5) of measuring the cutting edge position of the tool (9) used for turning with the tool sensor (11);
A tool change process (S7) in which the tool (9) used for the turning is replaced with a new tool (9) with respect to the turret (2B) after repeated machining;
A post-replacement reference tool measurement step (S8) in which the reference tool (20) is measured by the tool sensor (11);
1/2 of the difference between the measured value of the reference tool measurement process (S1) before machining and the measured value of the reference tool measurement process (S8) after replacement is set to the moving axis of the turret (2A) on the tool sensor (11) side. Thermal displacement correction amount setting process (S9) set as the correction amount (Δs);
A post-replacement tool measurement process (S11) in which the tool sensor side turret (2A) is corrected by this correction amount (Δs) and the blade position of the tool (9) after replacement is measured by the tool sensor (11). ,
Tool correction amount calculation that calculates the difference between the measured value in the initial tool measurement step (S5) and the measured value in the post-change tool measurement step (S10) and calculates the tool correction amount (Δx) based on the calculated value Process (S11);
A tool correction step (S12) for correcting the movement amount of the turret (2B) on the post-replacement tool side by the calculated tool correction amount (Δx).

  According to this correction method, ½ of the difference between the measured value in the reference tool measurement process (S1) before machining and the measured value in the reference tool measurement process (S8) after replacement is set to the turret (2A) on the tool sensor (11) side. Is set as a correction amount (Δs) of the moving axis of the tool, and the correction amount (Δs) is used to correct the movement amount of the turret (2A) on the tool sensor (11) side to thereby determine the tool tip position of the tool (9) after replacement. Measure with sensor (11). Therefore, even if the tool is changed when the temperature rises due to the operation of the lathe, the measurement can be performed in a state where the thermal displacement is canceled, the dimensional variation of the tool (9) after the change with respect to the old tool (9), and the mounting position Can be accurately corrected. Therefore, the first product after tool change can be improved.

This difference in inventions lathes, after replacement tool measurement control means for measuring the position of the cutting edge of the tool after replacement, the measurement result of the reference tool was measured before processing, the measurement result of the reference tool was measured after the tool change Since the turret with the tool sensor attached was moved with 1/2 of the thermal displacement correction amount, even if the tool was changed when the temperature rose due to lathe operation, the thermal displacement was canceled. Measurements can be made, and the dimensional variation of the replaced tool relative to the old tool, the variation of the mounting position, etc. can be corrected with high accuracy. Therefore, the first product after the tool change can be improved.
According to the lathe edge position correcting method of the present invention, 1/2 of the difference between the measured value of the reference tool measurement process before machining and the measured value of the reference tool measurement process after replacement is set as the correction amount of the moving axis of the turret on the tool sensor side. This tool is used to change the tool sensor side turret movement amount and to measure the tool edge position of the tool after replacement with the tool sensor. When the temperature rises due to lathe operation, the tool is changed. However, the measurement can be performed in a state where the thermal displacement is canceled, and the dimensional variation of the replaced tool with respect to the old tool, the variation in the mounting position, and the like can be accurately corrected. Therefore, the first product after the tool change can be improved.

A lathe according to a reference proposal example will be described with reference to FIG. This lathe is provided with two turrets 2A and 2B located on the left and right sides of the main shaft 1, respectively. The spindle 1 is rotatably installed on a spindle head 4 on the bed 3 and is driven to rotate by a spindle motor (not shown). Each of the turrets 2A and 2B is mounted on the left and right turret carriages 5 and can move in the left and right direction (X-axis direction) together with the turret carriage 5. Each turret carriage 5 is installed on the bed 3 so as to be movable left and right via a guide 7 and is moved left and right by a motor 8 via a feed screw 9. The motor 8 is a servo motor, and has a position detector 8a such as a pulse coder. The position detector 8a may be provided separately from the motor 8 to detect the left and right positions of the turrets 2A and 2B.

  The turrets 2A and 2B are drum-shaped tool rests having a polygonal front shape, and various tools 9 such as a cutting tool are attached to a tool station M including a peripheral surface portion between each corner. The turrets 2A and 2B are provided at the distal end of a turret shaft 6 that can be moved forward and backward on the turret carriage 5 and can rotate freely. The turrets 2A and 2B are parallel to the main shaft axis direction (Z-axis direction). It can move in the direction. Further, a rotation indexing motor 10 mounted on the turret carriage 5 can be rotated and indexed so that an arbitrary tool station M faces the main shaft 1.

Instead of the tool 9, a contact detector 11 a of the tool sensor 11 is attached to one tool station M in the turret 2 </ b> A. The tool sensor 11 includes a contact detector unit 11a and a measurement value capturing unit 11b that captures the current position of the position detector 8a when the contact detector unit 11a is turned on. As the contact detector 11a, for example, an energization detection type that energizes when the cutting edge of the tool 9 contacts the contact 11aa is used.
The other turret 2B is also provided with a contact detector 11a 'of the tool sensor 11' in the same manner as described above, but for the sake of simplicity of explanation, the tool sensor 11 on the one turret 2A side is used. Only the correction will be described.

  The lathe control device 12 includes a computer-type numerical control device and a programmable controller, and includes arithmetic control units 14A and 14B that control the left and right turrets 2A and 2B according to the machining programs 13A and 13B, respectively. The left and right calculation control units 14A and 14B and the machining programs 13A and 13B may be one calculation control unit and one machining program, respectively, but here, the operations of the left and right turrets 2A and 2B are easily understood. In order to show separately.

  The arithmetic control units 14A and 14B control the motor 8 that moves the left and right turrets 21 and 2B in the X-axis direction via the servo controllers 15A and 15B. In addition to this, the arithmetic control units 14A and 14B control the servo system of a motor (not shown) for driving the turrets 2A and 2B in the front-rear direction, and control the turning index motor 10 of the turrets 2A and 2B. Do. Further, a spindle motor (not shown) is controlled by either one of the arithmetic control units 14A and 14B.

The above configuration is the basic configuration of this lathe. In this proposed example , the following measurement control means 16, tool correction amount calculation means 17, and tool correction means 18 are provided for the above basic configuration. The measurement control means 16 moves both or one of the two turrets 2A, 2B, so that the tool 9 before the tool change held on the turret 2B opposite to the turret 2A to which the tool sensor 11 is attached is held. It is means for causing the tool sensor 11 to measure the cutting edge position and the cutting edge position after tool replacement. In this embodiment, both turrets 2A and 2B are controlled to move the same distance from each other. The measurement control means 16 has a pre-replacement control unit 16a that measures a blade edge position before tool replacement, and a post-replacement control unit 16b that measures a blade edge position after tool replacement.

The tool correction amount calculation means 17 obtains a predetermined difference by obtaining a difference between the edge position of the tool 9 before the tool change obtained by the measurement of the tool sensor 11 by the measurement control means 16 and the edge position of the tool 9 after the tool change. This is means for calculating the tool correction amount Δx.
The tool correction unit 18 is a unit that corrects the movement amount of the turret 2B using the tool 9 after the tool replacement by the correction amount Δx calculated by the tool correction amount calculation unit 17. That is, the movement amount in the movement command in the X-axis direction of the machining program 13B is corrected by the correction amount Δx when executed by the arithmetic control unit 14B.

  According to the lathe of this configuration, when the tool 9 is exchanged for the turret 2B on the opposite side to the tool sensor 11, first, the turrets 2A and 2B are moved under the control of the measurement control means 16 and held by the turret 2B. The tool sensor 11 is caused to measure the edge position of the tool 9 before the tool change. The tool sensor 11 is energized and turned on when the cutting edge of the tool 9 touches the contact 11aa, and the measurement value capturing unit 11b reads the position detection value of the position detector 8a by the ON signal. . This measured value is stored in an appropriate storage means. Then, the tool sensor 11 is made to measure the blade edge position of the new tool 9 after the tool change in the same manner as described above.

  The tool correction amount calculation means 17 obtains the difference between the blade tip position before the tool change obtained by the measurement of the tool sensor 11 and the blade tip position after the tool change, and sets the difference as the tool correction amount Δx. The tool correction amount calculation means 17 performs the appropriate processing such as multiplying a predetermined coefficient based on the above difference instead of the above difference as the tool correction amount Δx as it is to obtain the tool correction amount Δx. There may be. The tool correction amount Δx calculated in this way is set as a correction amount in the tool correction means 18 provided in the X-axis movement amount command unit in the calculation control unit 14B.

  The tool correction means 18 corrects the subsequent command value of the X-axis movement amount with the set correction amount Δx. Therefore, the tool-changed turret 2B moves with the corrected movement amount.

  By performing tool correction in this way, even if there is a tool change, processing according to the dimensions of the tool 9 before the replacement can be performed, and the difference in the processing dimensions before and after the tool replacement can be reduced as much as possible. Further, since the tool sensor 11 is provided on the rigid turret 2A, it is possible to measure the cutting edge with high accuracy and perform tool correction with high accuracy. Therefore, it is possible to process a non-defective product within the tolerance from the first product after the tool change.

The tool correction means 18 has a tool correction amount Δx for each tool station M of the turret 2B, and uses the tool correction amount Δx corresponding to the tool station M to be calculated for the spindle 1 for correction.
Moreover, although the said embodiment demonstrated the case where the tool sensor 11 was provided in the left turret 2A of a figure, the tool sensor 11 'was also provided in the right turret 2B, and the tool of the left turret 2A was carried out similarly to the above. Tool correction at the time of replacement may be performed. That is, tool correction at the time of tool change of the turrets 2A and 2B on both sides may be performed.

2 to 4 show an embodiment of the present invention. In this embodiment, the basic configuration described above, that is, the configuration of the machine part of the lathe, the configuration in which the lathe control device 12 is controlled by the arithmetic controls 14A and 14B according to the machining programs 13A and 13B, and the configuration of the tool sensor 11 are the proposed examples. Since this is the same, the description thereof is omitted.
In the lathe of this embodiment, in the basic configuration described above, the reference tool 20 is attached to one tool station M of the turret 2B, and the lathe control device 12 has the following pre-machining reference tool measurement control means 21, initial machining tool measurement control. Means 22, post-change reference tool measurement control means 23, post-change tool measurement control means 24, tool correction amount calculation means 25, thermal displacement correction means 26, and tool correction means 27 are provided.

The pre-machining reference tool measurement control means 21 moves both or one of the two turrets 2A and 2B before machining the lathe at the beginning of the day, and the turret 21A to which the tool sensor 11 is attached. Is means for measuring the position of the reference tool 20 held by the opposite turret 2B and storing the measurement result. In this embodiment, the turrets 2A and 2B on both sides are moved synchronously by the same movement amount.
The first machining tool measurement control means 22 is a means for measuring the position of the cutting edge of the tool 9 used for the machining in the same manner as described above after machining the first product after the start of operation and storing the measurement result.

  The post-replacement reference tool measurement control means 23 is a means for measuring the position of the reference tool 20 in the same manner as described above after replacing the turret tool and storing the measurement result.

  The post-replacement tool measurement control means 24 uses the tool sensor 11 with 1/2 of the difference between the measurement result of the pre-machining reference tool measurement control means 21 and the measurement result of the post-replacement reference tool measurement control means 23 as the thermal displacement correction amount Δs. Is a means for moving the turret 2A attached to and measuring the position of the cutting edge of the tool 9 after replacement. The thermal displacement correction amount Δs is set in the thermal displacement correction unit 26 that is provided in the arithmetic control unit 14A and corrects the command value in the X-axis direction, and is used for the movement amount correction by the thermal displacement correction unit 26.

The tool correction amount calculating means 25 is a means for calculating the tool correction amount Δx from the difference between the value measured by the post-replacement tool measurement control means 24 and the value measured by the initial product measurement control means 22.
The tool correction means 27 is a means for correcting the amount of movement of the turret 2B when machining using the tool 9 after tool replacement by the tool correction amount Δx calculated by the tool correction amount calculation means 25.

Next, an embodiment of a lathe edge position correcting method will be described with FIG. This cutting edge position correction method is a method for correcting the movement amount of the cutting edge position of the tool 9 in a lathe provided with two turrets 2A and 2B on both sides of the spindle 1 as in the example of FIG. The tool sensor 11 is attached to the other, the reference tool 20 is attached to the other turret 2B, and correction is performed through the following steps S1 to S12.
This blade edge position correction method is a method that can be applied without being limited to the configuration of the lathe control device 12 of FIG. 2. Here, for the sake of clarity of the configuration of FIG. 2, each function achievement means (21-21) of FIG. 27) and the like.

In FIG. 3, the following steps S1 to S12 are performed in order.
At the start of operation from the cooled state of the lathe at the beginning of the day, the turrets 2A and 2B are moved, and the position of the reference tool 20 is measured by the tool sensor 11 (pre-processing reference tool measurement process (S1). This is performed by the control of the pre-processing reference tool measuring means 21 in FIG.
The first workpiece (not shown) is turned with the tool 9 held by the turret 2B on the reference tool 20 side (first workpiece turning process (S2)).
The turned first workpiece is measured with a measuring tool (not shown) such as a micrometer or a caliper (first workpiece measurement step (S3)), and it is confirmed that the measured value of the first workpiece is within an allowable dimension. (Confirmation process (S4)). If the measured value of the first workpiece is not within the allowable dimension, the following processing is not performed, and some processing is performed again until the confirmation process (S4) after performing some adjustment.

The cutting edge position of the tool 9 used for turning is measured by the tool sensor 11 (initial tool measurement process (S5)). In this process, the first correct cutting edge position, that is, the cutting edge position to be machined within the allowable dimension is known. This process is performed under the control of the initial machining tool measurement control means 22 in FIG.
After performing each of such measurements, machining with the tool 9 after the replacement is performed (repeated machining process (S6)).
When the tool 9 used for this turning has a life due to repeated machining, the turret 2B is replaced with a new tool 9 (tool changing process (S7)).

When the tool is changed, the reference tool 20 is measured by the tool sensor 11 (post-change reference tool measurement process (S8)). This process is performed under the control of the post-replacement reference tool measurement control means 23 in FIG.
1/2 of the difference between the measured value of the reference tool measurement process before processing and the measured value of the reference tool measurement process after replacement is set as the correction amount of the moving axis of the turret on the tool sensor side (thermal displacement correction amount setting process) (S9)). That is, when this tool change is performed, the lathe temperature rises due to continuous machining, and thermal displacement occurs. This amount of thermal displacement appears as a difference from the measured value of the reference tool 20 during the first cooling. The difference between the measured values is ½ because thermal displacement occurs in both the turrets 2A and 2B on the tool sensor 11 side and the reference tool 20 side, and the sum appears as the difference between the measured values. is there.

  For example, as shown in a specific numerical example in FIG. 4, it is assumed that the positions of the left and right turrets 2A and 2B are separated from the spindle center by 100 mm in the pre-machining reference tool measurement process (S1). This is assumed to be 100.8 mm for the left turret 2A and 101.2 mm for the right turret 2B after the tool change. In the measurement of the reference tool 20 after the tool change, a value of 0.8 + 1.2 = 2.0 mm obtained by adding 0.8 mm and 1.2 mm of the thermal expansion amounts on the left and right sides is measured. Therefore, by correcting the thermal displacement by a value obtained by averaging this sum (0.8 + 1.2) /2=1.0, almost correct thermal displacement correction can be performed.

With this thermal displacement correction amount Δs, the amount of movement of the tool sensor side turret 2A is corrected, and the blade edge position of the tool 9 after replacement is measured by the tool sensor 11 (tool measurement process after replacement (S10)). By performing this thermal displacement correction, the position of the tool sensor 11 at the time of the first cooling is reproduced. This process S10 is performed by the processing of the post-replacement tool measurement control means 24 in FIG.

  After this measurement, the difference between the measurement value in the initial tool measurement process (S5) and the measurement value in the post-replacement tool measurement process (S10) is calculated, and the tool correction amount Δx is calculated based on the calculated value (tool) Correction amount calculation process (S11) The difference between the measured values may be used as the tool correction amount Δx as it is The difference between the measured values is the difference between the new tool 9 and the initial state of the tool 9 for the first time use. The flutter and the error of the mounting position appear as the above difference, and this correction amount calculation is performed by the tool correction amount calculation means 25 in FIG.

  The movement amount of the turret 2B on the post-replacement tool 9 side is corrected with the calculated tool correction amount Δx (tool correction step (S12)). Subsequent machining is performed with the movement amount corrected by the tool correction amount Δx. This tool correction is performed by the tool correction means 27 provided in the calculation control unit 14B of FIG.

  According to this blade edge position correction method, even when the tool is changed when the temperature rises due to the operation of the lathe, it is possible to measure in a state where the thermal displacement is canceled, and the tool 9 after the replacement with respect to the old tool 9 can be measured. Dimensional variation, variation in mounting position, etc. can be corrected with high accuracy. Therefore, the quality of the first product after tool change can be improved.

  In this embodiment, the tool correction means 27 has a tool correction amount Δx for each tool station M of the turret 2B, and uses the tool correction amount Δx corresponding to the tool station M calculated for the spindle 1 for correction.

  In the above embodiment, the tool sensor 11 is provided in the left turret 2A in the drawing. However, the tool sensor 11 'is also provided in the right turret 2B, and the reference tool 20 is provided in the left turret 2A. And the tool correction at the time of changing the tool of the left turret 2A may be performed in the same manner as described above. That is, tool correction at the time of tool change of the turrets 2A and 2B on both sides may be performed.

It is explanatory drawing shown combining the top view of the mechanism part of the lathe concerning a reference proposal example , and the block of a control system. It is explanatory drawing shown combining the top view of the mechanism part of the lathe concerning one Embodiment of this invention, and the block of a control system. It is a flowchart of the blade edge position correction method. It is explanatory drawing of the thermal displacement correction | amendment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main shaft 2A, 2B ... Turret 5 ... Turret carriage 8a ... Position detector 9 ... Tool 11 ... Tool sensor 11a ... Contact detector part 11b ... Measurement value taking-in part 16 ... Measurement control means 17 ... Tool correction amount calculating means 18 ... Tool correction means 18 ... Tool correction means 21 ... Cooling reference tool measurement control means 22 ... Initial machining tool measurement control means 23 ... Post-replacement reference tool measurement control means 24 ... Post-replacement tool measurement control means 25 ... Tool correction amount calculation means 26 ... Thermal displacement correction means 27 ... Tool correction means Δs ... Thermal displacement correction amount Δx ... Tool correction amount

Claims (3)

  In a lathe equipped with two turrets on both sides of the spindle, the tool sensor is attached to the turret, and both or one of the two turrets is moved before machining the lathe, opposite to the turret to which the tool sensor is attached. A pre-processing reference tool measurement control means for measuring the position of the reference tool held in the turret on the side and storing the measurement result, and measuring the edge position of the tool used for the processing after the processing of the first product in the same manner as described above. First-time machining tool measurement control means for storing measurement results, a post-replacement reference tool measurement control means for measuring the position of a reference tool after storing the turret tool and storing the measurement results, and the pre-machining reference tool Mounting of the tool sensor with 1/2 of the difference between the measurement result of the measurement control means and the measurement result of the reference tool measurement control means after replacement as a thermal displacement correction amount The tool measurement control means after replacement for measuring the blade edge position of the tool after replacement, and the difference between the value measured by the tool measurement control means after replacement and the value measured by the initial product measurement control means. Tool correction amount calculating means for calculating a correction amount; tool correction means for correcting the amount of movement of the turret when machining using the tool after the tool change by the correction amount calculated by the tool correction amount calculating means; Lathe equipped with. A method of correcting the amount of movement of the cutting edge position of a tool in a lathe having two turrets on both sides of the spindle, with a tool sensor attached to one turret and a reference tool attached to the other turret,
Before machining the lathe, the turret is moved to measure the position of the reference tool before measuring the reference tool measurement process,
An initial workpiece turning process of turning an initial workpiece with a tool held in the turret on the reference tool side;
An initial workpiece measurement process in which the turned initial workpiece is measured with a measuring tool;
A confirmation process for confirming that the measurement value of the first workpiece is within the allowable dimension;
Initial tool measurement process of measuring the cutting edge position of the tool used for turning with the tool sensor;
A tool change process in which the tool used for the turning is replaced with a new tool for the turret after repeated machining,
A reference tool measurement process after replacement for measuring the reference tool with the tool sensor;
A thermal displacement correction amount setting process for setting 1/2 of the difference between the measurement value of the pre-machining reference tool measurement process and the measurement value of the post-replacement reference tool measurement process as the correction amount of the moving axis of the turret on the tool sensor side; ,
The post-replacement tool measurement process in which the tool sensor side turret is corrected with this correction amount and the tool tip position of the tool after replacement is measured by the tool sensor,
A tool correction amount calculation process for calculating a tool correction amount based on the calculated value of the difference between the measurement value of the initial tool measurement process and the measurement value of the tool measurement process after replacement,
A tool correction process for correcting the movement amount of the turret on the tool side after the replacement with the calculated tool correction amount,
Lathe edge position correction method. In a lathe equipped with two turrets on both sides of the spindle, the tool sensor is attached to the turret, and both or one of the two turrets is moved before machining the lathe, opposite to the turret to which the tool sensor is attached. The measurement control means of the reference body before processing that measures the position of the reference body, which is a measurement-dedicated component held in the turret on the side, and stores the measurement results, and the cutting edge position of the tool used for the processing after processing the first product First-time machining tool measurement control means for measuring and storing the measurement result in the same manner as described above, and measuring the reference body after replacement for measuring the position of the reference body after storing the turret tool and storing the measurement result ½ of the difference between the measurement result of the control means and the measurement control means of the reference body before processing and the measurement result of the measurement control means of the reference body after the exchange is used as the thermal displacement correction amount. The turret with the tool sensor attached is moved, the post-replacement tool measurement control means for measuring the position of the tool edge after replacement, the value measured by the post-replacement tool measurement control means, and the initial product measurement control means A tool correction amount calculation means for calculating a correction amount from the difference between the values and a turret movement amount when machining using the tool after the tool change is corrected by the correction amount calculated by the tool correction amount calculation means. A lathe equipped with tool correction means.

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