JP2002079404A - Dimension controlling device for cutter position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dimension controlling device for a cutter position capable of providing a machining accuracy as high as ±0.5 μm required for the machining of a fluid bearing for HDDs by making corrections in a cutter position by feeding-back the measured values of the dimensions of a workpiece under machining to the cutter position. SOLUTION: A unit 20 for measuring the dimensions of the workpiece provided on a tool post is moved to a position where the cutter provided on the tool post can cut the workpiece to directly measure the dimensions of the calibration master M and the workpiece gripped by a chuck 6 in a head stock unit. A controller makes correction by feeding-back in the cutter position based on the measured values of the workpiece to the zero setting made based on the measurement by the calibration master M. In this constitution following-up performance for the feed-back correction values of the cutter position in relation to the workpiece is improved, as a result, the machining accuracy of the workpiece can be maintained regardless of the wearing of the cutter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool position and dimension control apparatus for automatically correcting the position of a cutting tool with respect to a work caused by wear of a cutting tool used for processing the work in a machine tool such as cutting.

[0002]

2. Description of the Related Art Conventionally, as a bearing for a drive shaft of a hard disk drive (HDD) used for a personal computer or the like, a fluid bearing made of stainless steel, which can be used with high rotational accuracy, is becoming mainstream. To manufacture a stainless steel fluid bearing with high rotational accuracy, dimensional accuracy of ± 0.5 μm is required. Further, in order to make the production of a fluid bearing profitable, it is necessary to be able to produce a large number of fluid bearings with a single machine such as a cutting machine. In order to ensure the dimensional accuracy of a large number of works, not only the performance of the machine tool (repetitive positioning, etc.) but also the wear of the cutting tool must be sufficiently considered.

Since the positioning of a workpiece in a machine tool is repeatedly performed for each workpiece, in order to maintain the processing dimensions of a large number of fluid bearings with high accuracy, the performance of the workpiece positioning and the like is large for a large number of processings. It must be kept about the work. Further, since the material of the work is a stainless steel material having high hardness, the wear of the cutting edge of the cutting tool tends to be severe. That is, the wear of the cutting tool tends to progress relatively quickly in the early stage of use of the cutting tool, but after a certain amount of processing, the wear amount tends to gradually shift to a substantially constant state. Therefore, even if the positioning accuracy of the work is good, the finishing accuracy depends on the wear of the cutting tool.In order to keep the work dimensions of the work within the allowable range, consider the wear of the cutting edge of the cutting tool. There is a need to.

[0004] The accuracy required of a current machine tool such as a cutting machine is a relatively coarse accuracy of about ± 2 µm as compared with the machining accuracy of a fluid bearing. For this reason, the operator can process the workpiece in response to this relatively coarse precision requirement by performing an off-machine measurement that measures the accuracy with the workpiece removed from the machine tool, or performing manual correction such as offset input to the machine tool. It is possible to As an automatic correction method, a similar in-machine measurement method has been tried in the past, but in the prior art, due to the uncertainty of the in-machine or out-of-machine measurement and the uncertainty of the machine tool following the feedback correction value, Even with the best accuracy, only the dimensional accuracy of about ± 1.5 μm has been obtained.
There is no example that achieves a high dimensional accuracy of about m.

[0005]

SUMMARY OF THE INVENTION A headstock unit having a rotating spindle and a chuck disposed at the tip of the spindle for gripping a workpiece, the spindle head unit being disposed opposite to the spindle head unit and being attached to the chuck. In a tool rest unit movably provided with a blade for performing processing on the workpiece in a gripped state, and a machine tool including a controller for controlling the position of the blade with respect to the workpiece, the size of the dimension of the processed workpiece There is a problem to be solved in that the measurement is performed accurately and the position of the blade with respect to the workpiece has good tracking performance with respect to the feedback correction value.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a headstock unit for holding and rotating a work on a chuck, a tool rest unit having a tool for processing a work, and In a machine tool equipped with a controller that controls the position of a blade with respect to a workpiece, a position of the blade is feedback-corrected based on a measured value of a dimension of a machined workpiece, so that a conventional machine tool cannot obtain the same. Another object of the present invention is to provide a tool position and dimension management device capable of obtaining a high machining accuracy of about ± 0.5 μm required for machining a fluid bearing of an HDD.

[0007] In order to achieve the above object, the present invention provides
It is configured as follows. That is, the present invention provides a headstock unit having a rotating spindle and a chuck disposed at the tip of the spindle for gripping a workpiece, the spindle head unit being disposed to face the spindle head unit, and being gripped by the chuck. A tool rest unit movably provided with a tool for processing the work in a state, and a controller for controlling a position of the tool with respect to the work, wherein the tool rest unit is a measuring tool for measuring the dimension of the work. A blade measuring unit, wherein the controller performs feedback correction of the position of the blade with respect to the workpiece based on a measurement value obtained by measuring the dimensions of the workpiece after processing by the inspection unit. Related to the device.

According to the tool position and dimension management device for the machine tool, since the tool rest unit is provided with the inspection unit for measuring the size of the work, the tool provided on the tool rest unit processes the work. In the position occupied by
By moving the inspection unit in place of the blade, the inspection unit directly measures the dimensions of the work held by the chuck in the headstock unit, and immediately sends the measured values to the controller. Performs feedback correction of the position of the blade with respect to the workpiece based on the measurement value obtained by measuring the dimension of the workpiece after processing by the inspection unit. In this way, the dimensions of the machined work are measured by the measuring unit provided in the machine tool, and the controller immediately feeds back the position of the blade based on the measured values obtained in the above manner. The dimensions of the machined work are accurately measured, and the followability of the position of the blade with respect to the work to the feedback correction value is improved.

In this blade position and dimension control apparatus, the inspection unit is opened when measuring the dimensions of the work in order to prevent dust from cutting powder, cutting coolant and mist generated when the blade processes the work. It is covered by a possible cover, inside which a temperature-controlled air is supplied. By covering the inspection unit with a cover that can be opened and closed, during non-measurement including during normal processing, cutting powder and cutting coolant and mist generated when processing the work do not adhere to the inspection unit, Further, since air whose temperature is controlled is supplied to the inside of the cover, the measurement unit does not cause an error due to the temperature, so that there is no inconvenience for measurement. on the other hand,
When measuring the size of the work, the cover can be opened to allow the inspection unit to access the work, and the clean inspection unit can always perform accurate dimension measurement.

When the cumulative number of machining of the workpiece by the cutting tool is small and the wear state of the cutting tool is an initial wear state, the feedback correction of the position of the blade with respect to the work is performed with high frequency, and the cumulative machining is performed. The feedback correction is performed less frequently as the number increases. If the cumulative number of machining equivalent to the initial stage of using the cutting tool is small according to the wear characteristics in which the amount of wear changes with the increase in the number of machining as described above, feedback correction is frequently performed. Even if feedback correction is performed less frequently as the cumulative number of machining increases due to the use of the cutting tool corresponding to the lapse of time, the position of the cutting tool with respect to the work is sufficiently and accurately corrected in accordance with the wear of the cutting tool. Is possible.

At the time of machining the work, based on the blade tool wear measurement data measured by the inspection unit up to the previous time,
By determining the next measurement timing by the inspection unit, the minimum required number of measurements can be obtained. By plotting the blade tool wear measurement data up to the last time on a graph,
It is possible to predict whether or not the processing dimension exceeds a predetermined value as the number of processing increases, and it is possible to automatically correct the position of the blade when it is expected to exceed the predetermined value. is there. When the wear of the cutting tool progresses beyond a certain level and becomes stable, the span of the number of processes for performing the automatic correction can be widened. In addition, by suppressing the number of times of measurement, it is possible to prevent the machining cycle time of the work from being extended.
In addition, the feedback correction is macro-controlled (program-controlled), and corresponds to an arbitrary dimensional tolerance.
The minimum required number of measurements is macro-changed.

In this blade position and dimension management device, a master check function capable of calibrating the inspection unit in the machine tool is provided. The headstock unit includes a master slide unit capable of holding a calibration master, and the inspection unit measures a dimension of the calibration master gripped by the master slide unit, and measures a dimension of the calibration master. The master check function is executed by performing zero setting of the inspection unit based on the measured values of the above. That is, by measuring the calibration master, it is possible to check whether or not the inspection unit is functioning properly, and to maintain the functioning correctly.

The cutting tool is a cutting tool for processing an iron-based work. A cutting tool for processing an iron-based work is a high-hardness cutting tool capable of continuously processing a considerable number of works. The cutting tool that processes iron-based workpieces has a fast initial wear rate, but after a period during which the initial wear rate is fast,
Transition to a stable state where the progress of wear is slow. The cutting tool to which the present invention is applied is not limited to a cutting tool for processing an iron-based work, but may be a cutting tool for processing a work made of any other material that causes wear of the cutting tool.

By using this tool position and dimension control device, a high dimensional tolerance of about ± 0.5 μm can be realized, but it is necessary to use a machine which can follow the feedback performed by the tool position and size control device. Yes,
Machine performance is also important.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a blade position and dimension managing apparatus according to the present invention; FIG. 1 is a plan view showing an embodiment of a headstock unit of a machine tool to which a tool position and dimension management apparatus according to the present invention is applied, and FIG. 2 is a diagram showing processing of a workpiece held by the headstock unit of the machine tool shown in FIG. FIG. 3 is a plan view of a tool rest unit provided with a tool to be used, FIG. 3 is a side view of a measuring unit of the tool rest unit shown in FIG. 2, and FIG. 4 is a plan view of the testing unit shown in FIG.

As shown in FIG. 1, a headstock unit 1 of a machine tool includes a fixed frame 2 attached to an installation base, a spindle 3 as a main spindle rotatably supported by the fixed frame 2, and The motor 4 includes a motor 4 disposed on the fixed frame 2 and having an output shaft connected to a base end of the spindle 3, and a chuck 5 attached to a tip end of the spindle 3. The chuck 5 is provided with a chuck claw 6 on the tip side so as to be openable and closable.
Thereby, the work W can be gripped. By operating the motor 4, the main shaft 3 rotates around the Z-Z axis together with the work W gripped by the chuck claws 6, and the work W
Is cut by selectively using the blade tools 14a to 14e provided in the tool rest unit 10 shown in FIG. In the headstock unit 1, a master slide unit 7 is provided in parallel with the spindle 3. The work W is, for example, a member that rotates relative to a shaft used for a fluid bearing of a hard disk drive (HDD) and is a component in which a hole into which the shaft fits is processed.

The tool rest unit 10 shown in FIG. 2 includes a fixed base 11 and a Z-axis direction with respect to the fixed base 11, an X-axis direction orthogonal to the Z-Z axis direction, or both a Z-axis and an X-axis. A movable frame 12 movable in a Y-axis direction perpendicular to the moving direction, and blade holders 13 a to 13 held by the movable frame 12.
e, blade tools 14a to 14e attached to the blade tool holders 13a to 13e, respectively, and a measurement unit 20 provided on the moving frame 12.
In FIG. 2, the tool rest unit 10 has a ZZ axis (of the main shaft 3 in FIG. (Coaxial with the axis of rotation).

FIGS. 3 and 4 show the inspection unit 20 on an enlarged scale. The measuring unit 20 includes a tracing stylus main body 21, a tracing stylus 22 held by the tracing stylus main body 21, for example, for measuring a dimension of the workpiece W, and a moving frame 12.
23 attached to the probe and covering the probe body 21
And a tracing stylus cover 24 provided to be openable and closable with respect to the case 23 and covering the tracing stylus 22, and a rotary actuator 25 for driving the tracing stylus cover 24 to open and close with respect to the case 23. The stylus 22 is, for example, a stylus (not shown) capable of measuring a hole diameter in accordance with the degree of opening of a divided tip, and has a positive value (large diameter side) and a negative value with respect to a predetermined hole diameter. Measure as a value (small diameter side). The tracing stylus cover 24 is normally in a closed state with respect to the case 23, and the cutting coolant and mist such as cutting chips and cutting oil of the workpiece during machining by the machine tool are used as the tracing stylus 2.
The stylus 22 is covered for dust prevention in order to maintain a clean state without soiling the stylus 2, but the stylus cover 24 is rotationally driven by the rotary actuator 25 when measuring the processing dimension of the work W. Thus, the work can be opened in the open state (indicated by the imaginary line in 24a), and the inspection unit 20 can access the work. Since the temperature-controlled air is supplied to the inside of the case 23 covered with the probe cover 24,
Zero does not cause a temperature error. With the probe cover 24 and the temperature-controlled air, accurate dimension measurement is always possible.

The inspection unit 20 includes a slide base 26 attached to the moving frame 12, a holder base 27 slidable in the X-axis direction by slide units 28, 28 with respect to the slide base 26, and a holder base 27 with respect to the holder base 27. A fixed holder 29 slidable in the Y-axis direction by the dovetail groove 30 is provided. Probe body 21
Are fixed to a fixed holder 29. Therefore, the tracing stylus main body 21 is slidable in the X-axis and Y-axis directions with respect to the slide base 26 by an actuator (not shown), and measures the position where the tracing stylus 22 abuts on the workpiece W and stops. In addition, the processing dimensions of the work W can be measured.

FIGS. 6 to 11 are flow charts showing the operation of the blade position and dimension management apparatus according to the present invention. FIG. 6 shows a flow of automatic correction of the blade position dimensions when the number of processes is two. That is, according to the blade position and dimension management device according to the present invention, first, the stainless steel calibration master M is set on the machine tool (step 1). FIG. 5 is a schematic diagram showing a measurement state of the calibration master M in the blade position and dimension management device according to the present invention. Master M for calibration by inspection unit 20
Is measured by the inspection unit 20 using the master slide unit 7. When performing the master check, the calibration master M is moved to the same position or in front of the chuck claw 6 of the chuck 5 so that the calibration master M can be measured by the tracing stylus 22. For example, with respect to the inner diameter of the calibration master M, A measurement is performed at a certain angle position to obtain data # 1 (step 2), and B is measured at a different angle position rotated by 90 ° from the A measurement position. The measurement is performed to obtain data # 2 (step 3). It is determined whether or not the difference (# 1- # 2) between data # 1 and data # 2 is 0.3 μm or less (step 4). If the determination in step 4 is negative, the calibration master M The setting is redone, A measurement and B measurement are performed, and data # 1 and data # 2 are measured. If the determination in step 4 is positive, the master check function is executed by setting all the measuring devices of the machine tool to zero in the data of the calibration master M (step 5).

Next, the actual processing of the work W is started (step 6), and the process shifts to the inspection processing when the cumulative number N of the work W is 1 (step 7). For the workpiece W of N = 1, A measurement is performed to obtain data # 3 (step 8), and B measurement is performed to obtain data # 4 (step 9). The difference between data # 3 and data # 4 (#
It is determined whether 3- # 4) is 0.3 μm or less (step 10). If the determination in step 10 is negative, the difference (# 3- # 4) due to the foreign matter attached to the inner diameter is obtained.
Is determined to be a large value, the inner diameter of the work W is cleaned by air blowing (step 11), and then the process returns to step 8, where A measurement and B measurement are performed again.
If the determination in step 10 is affirmative, the larger data of data # 3 and data # 4 (normally, the data with the larger absolute value is the minus value) in order to cope with the decrease in the cutting edge caused by the wear of the cutting tool. Is selected as the maximum value X (step 12). By inputting the maximum value X as data for correcting the NC controller of the machine tool, the actually measured value correction for the zero set performed based on the initial calibration master M is performed (step 13). That is, in the initial wear state in which the wear rate of the cutting tool is high, such as the accumulated processing number N = 1, the inner diameter tends to be small, and the measured value tends to be a large negative value. Accordingly, in the actual measurement value correction, a negative actual measurement value having a larger absolute value is input to the NC machine as a correction value, and the zero set performed based on the calibration master M based on the correction value is used as a tool. Alternatively, by correcting the position of the work, subsequent machining of the hole diameter of the work can be maintained at a predetermined accuracy regardless of the wear of the cutting tool.

Next, the second work W (cumulative processing number N =
The process proceeds to the inspection process of 2) (step 14).
For the work W of N = 2, A measurement is first performed to obtain data # 5 (step 15). It is determined whether or not the maximum value X (in this case, the actually measured value by the A measurement) is equal to or more than -1.0 μm (step 16). That the maximum value X is a negative value smaller than -1.0 μm is that, when measuring the inner diameter, chips and the like adhere to the hole wall.
It is considered that the halved tip of the tracing stylus 22 was shifted toward the approach side and a negative value having a large absolute value was detected. for that reason,
If the determination in step 16 is negative, the inner diameter of the work is cleaned by air blow, and the process returns to step 15 to perform the B measurement (step 17). The value measured by the B measurement is overwritten on data # 5. If the determination in step 16 is positive, as in step 13, the maximum value X is input to the NC processing machine as a correction value, and the position of the cutting tool or the workpiece is corrected with respect to the zero set based on the correction value. Value correction is performed (step 18). Although not in the flow, if the result of the B measurement does not result in the determination in step 16, the flow stops.

Next, the cumulative processing number (N) of the workpiece W is 10
It is determined whether or not the number is below (step 20). If the cumulative number of machining (N) exceeds 10, the flow shifts to the flow B and below. If the work number N is equal to or smaller than 10, the A measurement is executed for every n = 2 sample processing (every other one) to obtain data # 6 to data # 10 (step 22). It is determined whether the selected maximum value X is equal to or greater than -1.0 μm (step 23). If the determination in step 23 is negative, the inner diameter of the work W is cleaned by air blowing as in step 17 (step 24).
In step 22, a B measurement is made. Step 23
Is true, the selected maximum value X is 0.
It is determined whether it is 0 μm or less (Step 2).
5). In the case of measuring the inner diameter, taking into account that the cutting tool is worn out, it is not usually possible to process the large inner diameter in which the split tip of the tracing stylus 22 swings to the open side and the measured value appears to the plus side. It is determined whether it is 0.0 μm or less. If the determination in step 25 is negative, the process returns to step 20. If the determination in step 25 is true, the actual measurement value correction for the zero set is performed using the maximum value X as the correction value in the same manner as in step 13 (step 13). 2
6).

FIG. 8 is a flowchart after the flow B.
Is shown in It is determined whether or not the cumulative processing number (N) is 28 or less (step 30). If the cumulative processing number (N) exceeds 28, the flow shifts to flow C or lower. If the cumulative processing number (N) is 28 or less, the sample processing number n = 3
A measurement is performed for each of the cases (step 31), and data # 11
~ Data # 16 is obtained (step 32). It is determined whether the selected maximum value X is equal to or greater than -1.0 μm (step 33). If the determination in step 33 is negative, the B measurement is performed in step 32 after the inner diameter of the work is cleaned by air blowing (step 34). If the determination in step 33 is true, it is determined whether or not the selected maximum value X is equal to or less than 0.0 μm (step 35). Returning to step S35, if the determination in step S35 is positive, the actual measurement value correction similar to that in step S13 is performed (step S36).

FIG. 9 is a flowchart after the flow C.
This is shown in FIG. 10 and FIG. That is, when the cumulative processing number (N) is 48 or less, the measurement is performed every n = 5 sample processing numbers in accordance with the flowchart of FIG. 9, and when the cumulative processing number (N) is 98 or less, FIG. According to the flowchart, the measurement is performed every n = 10 sample processing, and when the cumulative processing number (N) is 198 or less, FIG.
The measurement is performed every n = 25 samples processed according to the flowchart of 1. The correction of the actually measured value based on the content of the measurement is the same as the processing performed according to the flowcharts shown in FIGS. 7 and 8, and therefore, detailed description thereof will not be repeated. It is preferable that the value of the cumulative processing number (N) and the value of the sample processing number (n) are previously determined to be optimum values according to the type of the blade, the material of the work, and the like.

With respect to the blade position and dimension management device, it is also possible to create and use a macro which creates a wear curve of the blade at any time based on the measurement value fed back in the automatic correction and determines the next measurement timing by itself. It is.

FIG. 12 is a graph showing the measurement stability of the inspection unit in the machine tool with respect to the number of measurements in the blade position and dimension management device according to the present invention. When the same workpiece is repeatedly measured, the horizontal axis represents the number of measurements, and the vertical axis represents the variation (unit: μm) of the tracing stylus. FIG.
Therefore, even if the number of measurements increases, the variation of the tracing stylus is within a certain range (−0.1 to −0.2 μm),
It is understood that even when the measurement unit 20 is attached to the tool rest and the same place is repeatedly measured, the measuring element including the mechanical accuracy is reliable.

FIG. 13 is a graph showing the wear curve of the cutting tool of the cutting tool with respect to the cutting distance (unit: m) of the machine tool in the cutting tool position and dimension control apparatus according to the present invention. It is understood that the wear of the cutting tool of the blade gradually increases as the number of processed workpieces increases. At first, the wear of the cutting tool progresses rapidly, but as the number of machining increases,
It is also understood that the amount of increase in the amount of wear decreases.

FIG. 14 is a graph showing a step response in the blade position and dimension management device according to the present invention. That is, it shows the followability of the machine tool to the command value of 0.1 μm. That is, it shows the followability of the machine (machine tool) when the command value of 0.1 μm is repeated 10 times. FIG. 15 is a graph showing repeated positioning data in the blade position and dimension management device according to the present invention. That is, as the repeat positioning accuracy with respect to the NC command value,
This indicates that the variation is within 0.1 to 0.2 μm.

[0030]

The blade position and dimension management device according to the present invention is configured as described above, and has the following effects. That is, a tool position and dimension management device according to the present invention includes a headstock unit for holding and rotating a work on a chuck, a tool base unit including a tool for processing a work,
And a controller for controlling the position of the blade with respect to the workpiece, and the position of the blade is feedback-corrected based on the measured value of the dimension of the processed workpiece, so that the dimension of the processed workpiece is provided in the machine tool. The measured value is sent to the controller immediately, so that the dimensions of the machined workpiece can be accurately measured and the feedback correction of the position of the blade with respect to the workpiece can be performed. The hard disk drive (HDD), which has been performed, has improved the followability of the blade to the workpiece, and has not been obtained with conventional machine tools.
± 0.5μm required for processing of hydrodynamic bearing used for
A high degree of processing accuracy can be obtained. Further, there is no need for manual correction by the operator, and fully automatic operation can be realized. Further, since the master check is periodically performed, maintenance of the measuring instrument in the machine tool can be easily performed.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a headstock unit of a machine tool to which a tool position and dimension management device according to the present invention is applied.

FIG. 2 is a plan view of a tool rest unit provided with a tool for processing a work held by a headstock unit of the machine tool shown in FIG. 1;

FIG. 3 is a side view of the inspection unit of the tool rest unit shown in FIG. 2;

FIG. 4 is a plan view of the inspection unit shown in FIG. 3;

FIG. 5 is a schematic diagram showing a measurement state of an inspection master work in the blade position and dimension management device according to the present invention.

FIG. 6 is a flowchart for performing automatic wear correction by the blade position and dimension management device according to the present invention,
FIG. 9 is a diagram illustrating a flow of automatic correction when the number of processes N is two.

FIG. 7 is a flowchart subsequent to the flow shown in FIG. 6, and shows a flow of automatic correction when the number of processes N is up to 10.

8 is a flowchart subsequent to the flow shown in FIG. 7, and is a view showing a flow of automatic correction when the number of processes N is up to 28. FIG.

9 is a flow chart subsequent to the flow shown in FIG. 8, and is a view showing a flow of automatic correction when the number of processing N is up to 48. FIG.

FIG. 10 is a flowchart subsequent to the flow shown in FIG. 9, showing a flow of automatic correction when the number of processes N is up to 98.

11 is a flow chart subsequent to the flow shown in FIG. 10, and is a view showing a flow of automatic correction when the number of processes N is up to 198. FIG.

FIG. 12 is a graph showing the measurement stability of the inspection unit in the machine tool with respect to the number of measurements in the blade position and dimension management device according to the present invention.

FIG. 13 is a graph showing a wear curve of a cutting tool of a cutting tool with respect to a cutting distance (unit: m) of a machine tool in the cutting tool position and dimension management device according to the present invention.

FIG. 14 is a graph showing a step response in the blade position and dimension management device according to the present invention.

FIG. 15 is a graph showing repeated positioning data in the blade position and dimension management device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 headstock unit 3 spindle 6 chuck 7 master slide unit 10 turret unit 14 cutting tool 20 inspection unit 21 measuring element 22 measuring element body 24 cover W work M calibration master N cumulative number of processing

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[Procedure amendment]

[Submission date] September 19, 2000 (2009.1.
9)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichiro Nakamura 3-3-1 Higashi Station, Koga-shi, Fukuoka F-term in Seibu Electric Machinery Co., Ltd. (reference) 3C029 AA01 3C045 HA07

Claims (7)

[Claims] 1. A headstock unit having a rotating spindle and a chuck disposed at a tip of the spindle for gripping a workpiece, and a headstock unit disposed opposite to the spindle head unit and gripped by the chuck. A tool rest unit movably provided with a tool for processing the work, and a controller for controlling a position of the tool with respect to the work, wherein the tool rest unit is a measurement for measuring a dimension of the work. A tool unit, wherein the controller performs feedback correction of the position of the blade with respect to the workpiece based on a measurement value obtained by measuring the dimensions of the workpiece after processing by the inspection unit. . 2. The measurement unit is covered with a cover that can be opened when measuring the dimensions of the work, in order to prevent dust from cutting powder, cutting coolant and mist generated when the blade processes the work. The blade position and dimension management device according to claim 1, wherein temperature-controlled air is supplied into the inside of the cover. 3. When the cumulative number of machining of the workpiece by the cutting tool is small and the wear state of the cutting tool is an initial wear state, the feedback correction of the position of the blade with respect to the work is performed with high frequency, The blade position and dimension management device according to claim 1, wherein the feedback correction is performed at a low frequency as the cumulative number of processes increases. 4. The following measurement timing by the inspection unit is determined based on the blade tool wear measurement data measured by the inspection unit up to the previous time when the work is processed, and the minimum required number of measurements is obtained. The blade position and dimension management device according to claim 3, wherein: 5. The tool position dimension according to claim 3, wherein the feedback correction is macro-controlled, and the minimum required number of measurements is macro-changed to correspond to an arbitrary dimensional tolerance. Management device. 6. The blade position and dimension management device according to claim 1, further comprising a master check function capable of calibrating the inspection unit in the machine tool. 7. The headstock unit includes a master slide unit capable of gripping a calibration master, and the inspection unit measures a dimension of the calibration master gripped by the master slide unit,
The blade position and dimension management device according to claim 6, wherein the master check function is executed by performing zero setting of the inspection unit based on a measured value of the dimension of the calibration master.