JPH1034496A - Machining center - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machining center having an intellectual machining system which puts machining results in order, classifies them and learn them. SOLUTION: A machining center 1 machines a mold by receiving an NC program which includes machining conditions from a CAD.CAM system 7, the faults in the past are taken into consideration to correct tool paths and machining methods (S1). This machining center 1 is provided with a vibration sensor 8 capable of detecting the chattering of the tool during machining and in process or tool breakage. When the tool 2 chats or is broken during mold machining, this information is immediately sent to the control part 3 of the machining center 1 (S2), and the line No. of the NC program, which caused such fault, is sent to a machining condition setting part 4 (S3). The machining condition setting part 4 sends the line No. of the NC program, which caused such fault to the CAD.CAM system 7 (S4), and returns the machining profile information when such fault was caused to the machining condition setting part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining center, and more particularly, to a cutting technology using a machining center, and more particularly, to a machining center having an intelligent machining system for organizing, classifying and learning machining results.

[0002]

2. Description of the Related Art For machining a mold having a curved surface, a machining center capable of storing various kinds of tools, exchanging tools at a time, and continuously operating unattended is often used. Is advantageous in that many tools can be used depending on the shape of the workpiece.

[0003] Machining centers have a high degree of freedom in cutting and are capable of processing a variety of shapes, but on the other hand, they use a large number of tools and use a wide variety of conditions. It is difficult to say that the work is being carried out in a sufficiently packed state, and an activity of converting the processing conditions into a database in the form of a list has been conventionally performed in order to improve the efficiency of the machining processing.

[0004] As for the cutting conditions of the machining center, basic recommended values are proposed by tool manufacturers and the like, depending on the work material and the tool. However, since the tool contact area fluctuates, these conditions are almost always limited. In the case of the above, it is not possible to directly apply in actual shape processing, and at present, an individual database is constructed or is being constructed on the user side.

For automatically inputting machining conditions of a machining center, see, for example, Japanese Patent Application Laid-Open No. 7-60603.
JP, JP-A-7-253810, JP-A-7-4
There is one disclosed in, for example, Japanese Patent Publication No. 0191.

[0006] Japanese Unexamined Patent Application Publication No. 7-60603 discloses a technique in which three-dimensional shape data is input from a three-dimensional shape data input unit and stored in a three-dimensional shape data file, and the basic processing condition data is converted into basic processing condition data. The data is input from the data input unit and stored in the processing basic condition data file, and the processing data automatic creation unit uses the three-dimensional shape data and the basic processing condition data to store the processing technology data possessed by a skilled processing engineer. By automatically creating machining data with reference to a machining technology database stored in advance and storing it in a machining data file, it is possible to quickly create high-quality machining data even if it is not a skilled engineer. is there.

[0007] Japanese Patent Application Laid-Open No. 7-253810 discloses a numerical control device for a machine tool having a function of automatically determining a tool and machining conditions. Database and
An input device for inputting user-specific tool and processing condition data different from the contents of the standard database; one or more user-specific databases in which data input by the input device is stored; a standard database and one or more By providing tool and processing condition automatic determination means for determining tools and processing conditions using both user-specific databases, the know-how of a skilled worker is taken into the database to automatically determine tools and processing conditions. Things.

When the data disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 7-40191 is determined not to be stored by the determining means, the second cutting condition value setting means sets the processing data among the newly inputted selected item data. A pre-defined pattern of the processing condition corresponding to the pattern formed by the selected detailed data for the specific item of the condition and a pre-defined data table of the cutting condition corresponding to the pre-defined pattern are read out from the second storage means. By automatically setting the cutting condition values based on the read existing data table at the time of automatic generation, the optimum cutting condition values according to the current machining condition are set.

Japanese Patent Laid-Open No. 7-2 discloses a method for locally changing the processing conditions where the tool path is bent.
There is one disclosed in Japanese Patent No. 53810. In this publication, when changing the speed before the cutting edge reaches the intersection of the round bar cutting line and the final machining shape while the cutting edge is cutting the round bar cutting line, the section to be changed, that is, the speed changing section, is set in advance by the operator. Is provided with speed change section input means for designating, and speed change section storage means for storing the speed change section inputted by this means is provided. The round bar cutting line command speed changing means comprises a round bar cutting line. Based on the command received from the command generation means, by changing the speed by the speed change section from the speed change section storage means and the post-change feed speed from the cutting cycle control means, by outputting the round bar cutting line command, It is intended to enable a fine-grained approach to tool protection.

[0010]

However, when the work is different, the work material amount, the tool protrusion amount, the tool path, and the tip curvature of the finishing tool are different, all of which affect the cutting conditions. Since there are many machining patterns, it is difficult to determine individual cutting conditions in advance.When producing a large variety of small dies such as a single point, the workpiece material and shape must Because of the differences, creating this kind of database was very difficult.

Further, in the apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 7-253810, it is necessary to accumulate reliable data on how to determine the conditions after changing the speed.

[0012] In addition, the wear of the tool is increased by continuous use, and the sharpness and the like are changed. However, the cutting conditions are determined in a state where the cutting tool is new and the sharpness is very good. The processing conditions which were not unreasonable in the state described above may become incompatible data if the sharpness is reduced due to the progress of tool wear. For this reason, considering the tool life cycle, the cutting conditions are suitable only at a very early stage.

[0013] Further, in the corner portion in pocket machining, the contact length of the tool fluctuates rapidly, so that tool chatter and breakage are liable to occur. In the prior art, the corner portion is cut from both sides, and a hole is previously formed in the corner portion. Leaving a certain radius of curvature in the tool path,
Means such as letting the CAM system extract a corner part and changing the feed speed of that part to a value possessed by the operator as know-how are taken.
In the above cases, the amount of work of the CAM operator is greatly increased, and in the above case, the value to be changed in the corner portion still depends on the skill of the operator.

Therefore, the processing information in the actual work is stored in NC
By constructing a processing system that organizes and accumulates as an index of an operation command at the time of creating a program, the database becomes very reliable.

The present invention has been made in view of the above-mentioned circumstances, and (1) to provide a machining system capable of steadily constructing a database of cutting conditions even through one-piece uniform die manufacturing. (2) ) Providing a machining system that proceeds machining by adopting appropriate machining conditions according to the conditions of tool wear. (3) Constructing a database with a set of machining shapes and machining conditions, and performing pocket machining. It is an object of the present invention to provide a machining system capable of storing optimum cutting conditions even for those requiring a local condition change.

[0016]

A first aspect of the present invention is a machining center used for die machining and the like, comprising: a data processing means for processing data required for machining; and a data processing means for processing the data processed by the data processing means. A machining center having a control means for controlling the machining center based on the measurement means for measuring the rotational runout of the tool, an observation means for observing the tip of the tool, and a vibration detection means for detecting abnormal vibration of the tool. Having a state of the tool detected by the measurement unit, the observation unit, and the vibration detection unit, and an NC program executed by the tool at a line number level of the NC program. It is characterized by processing the data necessary for processing in accordance with it, and if it is incompatible with actual processing in a series of programs Can be clearly identified and the filtrate,
As a result, the processing conditions of that part can be locally corrected.

According to a second aspect of the present invention, in the first aspect, the data processing means accumulates at least the specification data of the tool, the measurement result by the measurement means, and the observation result by the observation means. A tool management unit;
A CAD / CAM section for generating a C program, a machining condition setting section for setting a machining condition by associating a machining result of a workpiece with data of the tool management section and the CAD / CAM section, and the machining condition setting It is characterized by having a machining condition database section that stores machining condition data set by the section. The implemented machining conditions and machining results, the shape of the machining target, the cutting method, the state of the tool used, and the tool specifications In a form associated with each other, the information is stored as information without human intervention, and a database based on actual work processing can be constructed.

According to a third aspect of the present invention, in the first or second aspect, the measuring means measures a tool diameter, a tool length, and a rotational runout of the tool without touching the tool with the tool mounted. It is characterized by having a non-contact type sensor that does not hurt the tool edge with a measurement probe, conversely does not deteriorate the probe tip with the blade edge, and can also measure with the rotation speed at the time of machining It is made possible.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the observing means is arranged such that the tip of the tool is 2
An observation device for observing the tip of the tool in one or more different directions, a recording device for recording the result observed by the observation device as digital image data, and capable of reproducing the image data recorded on the recording device And a transfer means for transferring to a device such as a personal computer.
It is possible to easily catch the state of wear, such as a small frame or worn out, and the location of the wear (local or wide area).

According to a fifth aspect of the present invention, in the second aspect of the present invention, when the vibration detecting means has a vibration sensor, and the vibration sensor detects a vibration amount exceeding a predetermined value, The vibration data when the vibration amount is detected, the line number of the NC program of the CAD / CAM unit, and the data of the tool management unit are transmitted to the machining condition setting unit. Thus, the degree of the defect can be grasped even at the time of later processing condition search.

According to a sixth aspect of the present invention, in the invention of the second to fifth aspects, when the observation means detects an amount of wear exceeding a predetermined value, the wear data when the amount of wear is detected is detected. And the NC program of the CAD / CAM unit is transmitted to the machining condition setting unit. Even if the vibration of the tool is small, the machining condition check which is not suitable from the tool wear progress degree can be performed. It is made possible.

According to a seventh aspect of the present invention, in the invention of the second to sixth aspects, the machining condition database section uses the tool vibration amount, the tool wear amount, and the machining efficiency of the tool when the tool is used. It is characterized in that it can be arranged in an order, and is effective in processing in which particular conditions are emphasized.

According to an eighth aspect of the present invention, in the second to seventh aspects, the CAD / CAM unit predicts the occurrence of a failure at the time of creating an NC program, based on data of machining conditions when the failure occurred. For automatically checking a location where a failure is predicted to occur in a created machining program, and the database does not store optimal machining conditions. In this case, it is possible to check the conditions that must be avoided.

According to a ninth aspect of the present invention, in the invention of the second to eighth aspects, when the CAD / CAM unit receives a line number of an NC program that has caused a problem during processing, the CAD / CAM unit performs processing up to the tool path. The product shape is represented by a solid model, the contact state between the tool and the workpiece at the time of the failure is specified, the command in the CAD that created the tool path is attached as a label, and the information on the contact state is attached. Is transferred to the processing condition setting section, and the optimum cutting conditions in which the conditions are changed according to the location in the tool path can be automatically set.

According to a tenth aspect of the present invention, in the fifth to ninth aspects, the vibration sensor has a response frequency of 20 kHz.
The following acceleration pickup is capable of detecting accelerations of three orthogonal components of XYZ, so that the detection capability is further improved and the dominant vibration direction can be grasped. It was done.

According to an eleventh aspect of the present invention, in any one of the fifth to tenth aspects, the acceleration pickup of the vibration sensor is disposed so as to coincide with an axial direction of a main shaft of the machining center. Therefore, it is not necessary to add complicated processing to the vibration data, and the vibration state of the tool can be easily grasped.

According to a twelfth aspect of the present invention, in the fourth to eleventh aspects, the observing means performs image processing on the obtained image of the tip of the tool to extract a wear region, and determines a width of the wear region. It is characterized in that the wear amount of the tool is quantified by automatically measuring in a specific direction, and highly reliable data excluding reading errors and the like can be stored.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a main part of a machining center according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a machining center, reference numeral 2 denotes a tool, reference numeral 3 denotes a machining center controller, and reference numeral 4 denotes machining. Condition setting unit, 5 is a tool management unit,
6 is a processing condition database unit, 7 is a CAD / CAM system, 8 is a vibration sensor, and M is a tool evaluation module.

The machining center 1 receives machining conditions from the CAD / CAM system 7 and receives an NC program in which conditions in consideration of past defects, tool paths and cutting methods have been modified (S1), and performs die machining. The machining center 1 is provided with a vibration sensor 8 capable of detecting chatter or breakage of the tool in process during machining.

If a problem such as chattering or breakage of the tool 2 occurs during the die machining, this information is immediately sent to the machining center controller 3 (S2), and a. The line number of the NC program that caused the failure, b. Spindle speed and feed rate, which are the actual machining conditions, c. The information of the spindle load is sent to the machining condition setting unit 4 (S3).

The processing condition setting unit 4 is adapted to set the NC
The line number of the program is sent to the CAD / CAM system 7 (S4), causing a problem a. Toolpath, b. Shaving pattern, c. The machining shape information consisting of the angle of the machining surface, is returned to the machining condition setting unit 4 (S
5).

Here, the "tool path" refers to a tool trajectory style such as a scanning line or a contour line, and information indicating which part (corner or not) in the path, and a "sharpening pattern". Are approaches, shoulder milling, inner or outer contour machining, area machining, pocket machining, etc., which correspond to the cutting patterns provided in the CAM system used. The “angle of the processing surface” is information for determining whether the processing portion is a standing wall, a bottom surface, or the like.

FIG. 2 is a view for explaining the tool evaluation module M of the embodiment shown in FIG. 1. In FIG. 2, parts having the same functions as those in FIG. 1 are denoted by the same reference numerals. .

For the tool used in the machining, the run-out and wear state of the tool are previously measured by the tool evaluation module M on the machine (S6), and the tool management unit 5 establishes a predicted life from the wear state. , Used within its cutting length.

When the used tool 2 is removed and replaced with a new one, the actual life value of the removed tool 2 is taken into the tool management unit 5 as basic data for predictive life calculation (S).
6).

When trouble such as chatter occurs in the tool 2,
As information on the tool 2 used at that time, the tool management unit 5 measures the data such as the wear state and run-out state of the tool 2 before and after use and the tool specifications such as tool maker, tool material, coating, blade length, and torsion angle. Is passed to the machining condition setting unit 4 (S8).

The processing condition setting unit 4 determines, based on the information, a. Processing conditions, b. Work shape information, c. The tool information is sent to the machining condition database unit 6 in a predetermined format (S9) and stored as "conditions requiring change".
The condition changes that can be adjusted by the machining center operator are the spindle rotation speed and the feed speed. If a defect can be suppressed by this change, the result is taken in as "good machining conditions".

This processing condition database section 6 is a CAD
・ Linked to the CAM system 7, the programmer inputs the work material and tool information in advance and starts the CAM, so that the optimal cutting conditions are automatically presented when the tool path and cutting pattern are determined. Yes (S10)
It has a mechanism.

The cutting amount is represented by a solid model from the blank, the volume of the workpiece removed by each tool trajectory is calculated, and machining is performed in consideration of the chip volume per unit time and the contact length of the tool cutting blade. Simulate the occurrence of trouble at the time.

In addition, even for a part that needs to be locally reduced in processing conditions, such as a corner part in pocket processing, the system has a function of automatically checking a part that needs to be changed and displaying the part. When the operator approves the condition change, the spindle speed or feed speed of the local part is automatically changed to the optimum value.

[0041]

According to the first aspect of the present invention, there is provided a machining center used for die machining or the like, wherein the data is processed based on data processed by the data processing means for processing data necessary for processing. In a machining center having a control means for controlling the machining center, a measurement means for measuring the rotational runout of the tool, an observation means for observing the tip of the tool, and a vibration detection means for detecting abnormal vibration of the tool, The data processing means processes the state of the tool detected by the measurement means, the observation means, and the vibration detection means, and the NC program executed by the tool in correspondence with the line number level of the NC program. Since the data required for the machining is processed, the line number of the NC program in which a problem occurred during machining is obtained based on the signal indicating the vibration state of the tool. By doing so, it is possible to clearly identify the nonconformity at the time of actual machining in a series of programs, and it is possible to locally correct the machining conditions at that part, and to improve machining efficiency in the entire program It is possible to optimize the processing conditions without lowering the processing cost.

According to a second aspect of the present invention, in the first aspect, the data processing means accumulates at least specification data of the tool, a measurement result by the measurement means, and an observation result by the observation means. A tool management unit;
A CAD / CAM section for generating a C program, a machining condition setting section for setting a machining condition by associating a machining result of a workpiece with data of the tool management section and the CAD / CAM section, and the machining condition setting Since it has a processing condition database unit that stores the processing condition data set by the unit, it is possible to exchange information with each other by linking each functional unit that constitutes the processing system, Machining result, shape to be machined, shaving method,
The state of the used tools and the tool specifications are stored as information in a form correlated with each other without any manual operation, and a database based on actual work processing can be constructed.

According to a third aspect of the present invention, in the first or second aspect, the measuring means measures a tool diameter, a tool length, and a rotational runout of the tool without touching the tool with the tool mounted. A non-contact type sensor that can measure the runout of the tool in the actual machining state.In addition, since it is a non-contact type sensor, the tool tip is damaged by the measurement probe, or the probe tip is deteriorated by the blade tip. Without
It is also possible to perform measurement while giving the number of rotations during processing.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the observing means is arranged such that the tip of the tool is 2
An observation device for observing the tip of the tool in one or more different directions, a recording device for recording the result observed by the observation device as digital image data, and capable of reproducing the image data recorded on the recording device Since it has a transfer means for transferring to a device such as a personal computer, it is possible to detect both wear in the radial direction and wear in the length direction of the tool. Alternatively, it is possible to easily catch the state of wear, such as wear, and the location of wear (local or wide area).

According to a fifth aspect of the present invention, in the second aspect of the present invention, when the vibration detecting means has a vibration sensor, and the vibration sensor detects a vibration amount exceeding a predetermined value, The vibration data when the vibration amount is detected, the line number of the NC program of the CAD / CAM unit, and the data of the tool management unit are transmitted to the processing condition setting unit. By sensing tool vibration in the process, it is possible to identify the line number in the program that caused the problem, and by associating it with the vibration data, the degree of the problem can be determined even when searching for machining conditions later. You can figure out.

According to a sixth aspect of the present invention, in the invention of the second to fifth aspects, when the observation means detects a wear amount exceeding a predetermined value, the wear data when the wear amount is detected. And the NC program of the CAD / CAM unit are transmitted to the machining condition setting unit, so that even if the vibration of the tool is small, it is possible to check the machining conditions that are not suitable from the degree of progress of tool wear.

According to a seventh aspect of the present invention, in the invention of the second to sixth aspects, the machining condition database unit uses the amount of vibration by the tool, the amount of wear of the tool, and the machining efficiency of the tool when the tool is used. Can be ordered, so
This is effective in machining where special conditions such as "I want to extend the tool life as much as possible for unmanned operation" are emphasized.

According to an eighth aspect of the present invention, in the second to seventh aspects, the CAD / CAM section predicts the occurrence of a failure at the time of creating an NC program, based on data of machining conditions when the failure occurred. Since it has a prediction means for accumulating actual failure cases based on rules and making it into a database, it is possible to automatically check places where failures are predicted to occur in the created machining program, Further, even when the optimum processing condition is not stored in the database, the condition to be avoided can be confirmed, and the usable condition can be easily estimated.

According to a ninth aspect of the present invention, in the invention of the second to eighth aspects, when the CAD / CAM unit receives a line number of an NC program which has caused a problem during processing, the CAD / CAM unit performs processing up to the tool path. The product shape is represented by a solid model, the contact state between the tool and the workpiece at the time of the failure is specified, the command in the CAD that created the tool path is attached as a label, and the information on the contact state is attached. Is transferred to the processing condition setting unit, so that the cutting conditions are greatly affected by the contact state between the tool and the workpiece,
With this function, even when a tool path whose contact state fluctuates greatly is set, it is possible to automatically set optimum cutting conditions in which conditions are changed according to the location in the tool path.

According to a tenth aspect of the present invention, in accordance with the fifth to ninth aspects, the vibration sensor has a response frequency of 20 kHz.
Since the following acceleration pickup detects the acceleration of three components orthogonal to each other in XYZ, to detect the chatter of the tool, the method of taking in an acceleration signal has high sensitivity and takes in accelerations in three axial directions simultaneously. By doing
The detection capability is further improved, and the dominant vibration direction can be grasped.

According to an eleventh aspect of the present invention, in the invention of the fifth to tenth aspects, the acceleration pickup of the vibration sensor is disposed so as to coincide with the axial direction of the main shaft of the machining center. It is not necessary to add complicated processing to the vibration data, and the vibration state of the tool can be easily grasped.

According to a twelfth aspect of the present invention, in the invention of the fourth to eleventh aspects, the observation means performs image processing on the obtained image of the tip of the tool to extract a wear region, and determines a width of the wear region. Since the wear amount of the tool is automatically measured in a specific direction and the amount of wear of the tool is quantified, it is possible to quantify the amount of wear of the cutting edge to be focused on without taking manual operation from the captured image information. Highly reliable data can be stored.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram for explaining an embodiment of a machining center according to the present invention.

FIG. 2 shows a tool evaluation module M of the embodiment shown in FIG.
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Machining center, 2 ... Tool, 3 ... Machining center control part, 4 ... Machining condition setting part, 5 ... Tool management part, 6 ...
Machining condition database, 7 CAD / CAM system,
8: vibration sensor, M: tool evaluation module.

Claims (12)

[Claims] 1. A machining center used for die machining and the like, comprising: data processing means for processing data necessary for machining; and control means for controlling the machining center based on the data processed by the data processing means. In the machining center having, the measuring means for measuring the rotational runout of the tool, observation means for observing the tip of the tool, and vibration detection means for detecting abnormal vibration of the tool, the data processing means, The state of the tool detected by the measurement means, the observation means, and the vibration detection means,
A machining center for processing data necessary for machining by associating the NC program executed by the tool with a line number level of the NC program. 2. A tool management unit for storing at least specification data of the tool, a measurement result by the measurement unit, and an observation result by the observation unit, and a CAD for generating the NC program. A CAM section, and a machining result of the workpiece, the tool management section and the CAD
2. The apparatus according to claim 1, further comprising: a processing condition setting unit that sets a processing condition in correspondence with data of the CAM unit; and a processing condition database unit that stores the processing condition data set by the processing condition setting unit. The machining center described in 1. 3. A non-contact type sensor for measuring a tool diameter, a tool length, and a rotational runout amount of a tool without touching the tool when the tool is mounted. The machining center according to 1 or 2. 4. An observation device for observing the tip of the tool in two or more different directions with respect to the tip of the tool, and a result of observation by the observation device is recorded as digital image data. The machining center according to any one of claims 1 to 3, further comprising a recording device that performs the recording and a transfer unit that transmits image data recorded in the recording device to a device such as a personal computer that can reproduce the image data. 5. The vibration detecting means includes a vibration sensor, and when the vibration sensor detects a vibration amount exceeding a predetermined value, the vibration data when the vibration amount is detected and the CAD data. The line number of the NC program of the CAM unit and the data of the tool management unit are transmitted to the machining condition setting unit.
The machining center according to any one of the above. 6. When the observation means detects a wear amount exceeding a predetermined value, the wear data at the time when the wear amount is detected and an NC included in the CAD / CAM unit.
The machining center according to claim 2, wherein a program is transmitted to the machining condition setting unit. 7. The machining condition database unit can rank tools to be used based on a vibration amount of the tool when the tool is used, a wear amount of the tool, and a machining efficiency by the tool. 7. The machining center according to any one of 2 to 6. 8. The CAD / CAM unit according to claim 2, further comprising prediction means for predicting the occurrence of a failure when creating an NC program, based on data of machining conditions when the failure occurred. The machining center according to any one of claims 1 to 7. 9. When the CAD / CAM unit receives a line number of an NC program that has caused a problem during machining, the CAD / CAM unit expresses the shape of the processed product up to the tool path in a solid model, and the problem occurs. The contact state between the tool and the workpiece at the time is specified, a command in the CAD that created the tool path is attached as a label, and the information on the contact state is transferred to the processing condition setting unit. The machining center according to claim 2. 10. The vibration sensor has a response frequency of 20 k.
The machining center according to any one of claims 5 to 9, wherein an acceleration pickup of less than or equal to Hz and capable of detecting accelerations of three orthogonal components of XYZ. 11. The vibration sensor according to claim 5, wherein an acceleration pickup of the vibration sensor is disposed so as to coincide with an axial direction of a main shaft of the machining center.
The machining center according to any one of the above. 12. The observation means performs image processing on the obtained image of the tip of the tool to extract a wear area, and automatically measures the width of the wear area in a specific direction to determine the amount of wear of the tool. The machining center according to claim 4, wherein the machining center is quantified.