JP6933603B2 - Machine tool measurement capability evaluation method and program - Google Patents

Description

The present invention broadly relates to a method for evaluating the measurement error and measurement ability of a machine tool, and more specifically, evaluates the measurement error and measurement ability of a numerical control machine (NC or CNC machine tool) capable of multi-axis control. , Methods for confirming the reliability of on-board measurement, etc.

Conventionally, when measuring the dimensions of mechanical parts or machining, for example, the tip of a probe (measurer) that can be moved and controlled in three dimensions is brought into contact with an object to be measured set on a measurement / machining table to a predetermined position. The error and accuracy have been evaluated by measuring the error, and various measures have been taken to improve the error and accuracy.

For example, a measurement error evaluation method has been proposed that can easily and highly accurately evaluate the straightness of each mechanical axis of a coordinate measuring machine and the error evaluation of the squareness between the mechanical axes (Patent Document 1).

That is, Patent Document 1 describes a measurement error evaluation method of a three-dimensional measuring machine configured so that the probe tip moves relative to the object to be measured along three machine axes orthogonal to each other. A gauge for a three-dimensional measuring machine having a plurality of spheres arranged with their centers aligned on a straight line inclined in the virtual reference plane with respect to the reference axis set in the virtual reference plane, the reference axis of 3 The first procedure of setting on the measurement table of the three-dimensional measuring machine so that one of the dimensional measuring machines is parallel to the machine axis direction and the virtual reference plane is parallel to one of the remaining two machine axes. A second procedure in which a Cartesian coordinate system in which the direction of the reference axis is the direction of one coordinate axis is set on the virtual reference plane and the center position of each sphere with respect to this coordinate system is measured by a three-dimensional measuring machine. A third procedure in which the gauge for a three-dimensional measuring machine is inverted 180 degrees around the reference axis and set again on the measurement table of the three-dimensional measuring machine, and Cartesian coordinates in which the direction of the reference axis is the direction of one coordinate axis. An error evaluation method for a three-dimensional measuring machine, which comprises setting a system on the virtual reference plane and sequentially performing a fourth procedure of measuring the center position of each sphere with respect to this coordinate system by the three-dimensional measuring machine. It is disclosed.

In addition, considering that the calibration of the surface texture measuring machine has conventionally required time, labor and skill, we also propose a calibration method of the surface texture measuring machine that calibrates the surface texture measuring machine easily and accurately. (Patent Document 2).

That is, in Patent Document 2, an arm that is swingably supported with a base point as a fulcrum and an object to be measured from a substantially tangential direction of an arc provided on the other end side of the arm and drawn by the tip of the stylus by the swing. A stylus having the stylus at its tip that is in contact with or close to the measuring element, a moving means that moves the arm in the x direction while the stylus is in contact with or close to the surface of the object to be measured, and the x direction of the base point. The first detecting means for detecting the displacement of the arm, the second detecting means for detecting the displacement in the z direction due to the swing of the arm based on the amount of displacement of the point on the arm in the z direction, and the first detection. The surface of the object to be measured is measured by providing the means and a correction calculation means for obtaining measurement data of the surface of the object to be measured by correcting the amount of deviation caused by the swing with respect to the detection result of the second detection means. In the calibration method of the surface texture measuring machine, the measurement step of measuring the calibration gauge including a part of a substantially perfect circle in the cross-sectional shape, and the center coordinates of the calibration gauge are (x _c , z _c ) and the radius is r. Based on the substitution step of substituting the detection results of the first detection means and the second detection means obtained in the measurement step into the evaluation formula based on the equation of the circle, and the results obtained in the substitution step. A method for calibrating a surface texture measuring machine, which comprises a calibration step of calibrating each parameter included in the deviation amount together with a gain of the z coordinate of the tip of the stylus with respect to the detection result of the second detection means. Is disclosed.

Further, while providing a three-dimensional coordinate measuring machine gauge that can be configured with higher accuracy and more easily, an accuracy evaluation method using the three-dimensional coordinate measuring machine gauge has also been proposed (Patent Document 3).

That is, Patent Document 3 describes a gauge for evaluating the accuracy of a three-dimensional coordinate measuring machine, which is a substrate having a flat upper surface, a first row of spheres arranged on the upper surface of the substrate, and an upper surface of the substrate. A three-dimensional coordinate measuring machine gauge is disclosed, which comprises a second row of spheres that are arranged at an angle with respect to the other. Then, as a specific configuration example, the first sphere 4 and the second sphere 5 fixed to the surface of the substrate 3 and the first pillar 7 protruding from the surface of the substrate 3 are fixed. A three-dimensional coordinate measuring machine gauge 1 for accurately evaluating the three-dimensional coordinate measuring machine is disclosed by providing the third sphere 6.

Further, a calibration method of a measuring machine that can simultaneously obtain the optimum calibration value of the arm length and the stylus height has been proposed (Patent Document 4).

That is, Patent Document 4 includes a detector provided so as to be movable in the X direction, and a stylus oscillatingly supported in the XZ plane at a fulcrum provided in the detector. In a measuring machine that obtains the surface roughness and contour shape of the work based on the amount of movement of the detector in the X direction and the amount of change of the stylus in the Z direction when the surface of the work is traced, the stylus from the fulcrum. Enter the design value of the stylus height, which is the Z-direction distance of the tip of the stylus, the design value of the arm length, which is the X-direction distance of the tip of the stylus from the fulcrum, and the design value of the tip radius of the stylus. The measurement range is divided into a plurality of steps in the height direction with respect to the first ball gauge having a known radial dimension, the first ball gauge is traced with a stylus, and the measurement range is different in the height direction. A plurality of measurement data of the first ball gauge are obtained, and the two surfaces of a step gauge having two surfaces parallel to each other and having known step dimensions are placed parallel to each other in the X direction, and the two surfaces are traced by the stylus. The step measurement data is obtained, and the second ball gauge having a smaller diameter than the first ball gauge and having a known radial dimension is traced with a stylus to obtain the measurement data of the second ball gauge. , The tip radius value of the stylus is tentatively calibrated based on the measurement data of the second ball gauge, and the plurality of measurement data of the first ball gauge, the measurement data of the step gauge, and the tentatively calibrated stylus. The feature is that the stylus height and the arm length are calibrated at the same time by calculating a predetermined evaluation function based on the tip radius value of and performing an optimization calculation until the calculated value converges. The calibration method of the measuring machine is disclosed.

Japanese Unexamined Patent Publication No. 2001-330428 Japanese Unexamined Patent Publication No. 2004-333312 Japanese Unexamined Patent Publication No. 2012-58057 Japanese Unexamined Patent Publication No. 2015-175704

To summarize the conventional situation, when a workpiece is measured on a machine tool, it is difficult to judge the reliability of the measured value. The causes include mechanical error, the influence of thermal expansion, the influence of contamination such as chips, and the like. Therefore, regarding the evaluation of the measurement result when the work is measured on the machine of the machine tool, the work is measured in advance with a caliper, a micrometer, or a coordinate measuring machine, and the measurement result is regarded as correct on the machine machine. It was judged as a guide only from the viewpoint of how much the results measured in 1 deviated. In this case, if the measurement result on the machine tool is within the required tolerance range of the work, it has been judged to be good for the time being, but the quantitative criterion for determining whether the value is truly correct has not been known. Therefore, it was difficult to handle the measurement results measured on the machine tool as a formal measurement report.

On the other hand, in recent years, machine tools have become more and more multifunctional and automated, and once the work is set on the machine tool, a series of machining from roughing to finishing and side machining such as 5 axes can be performed by full automation. It tends to be implemented. Therefore, the measurement process for determining whether or not the processed workpiece is finished with the required specifications has become an important process again, and a new measurement capability evaluation method in this sense is required.
If this process can be performed on the machine, it can be expected that the work efficiency will be improved. In addition, since machine tools change over time, it is desirable to evaluate the measurement capacity on a regular basis, monitor the trends, and add them to the criteria for judgment.

Therefore, the measurement capability evaluation method according to the embodiment of the present invention is a method for evaluating the measurement capability of the machine tool among the systems including the machine tool and the terminal connected to the machine tool. A step of inputting a measurement result of a work to be measured in advance, a step of determining a tolerance, a step of repeatedly measuring a measurement site of the master work a predetermined number of times using the work as a master work, and a result of the repeated measurement of the predetermined number of times. Is included in the step of comparing with the tolerance, and in the step of comparing, it is determined whether or not the measuring ability of the machine tool is good. The measurement by the probe is included, and the measurement by the work measurement probe is controlled so that the tip of the work measurement probe is in direct contact with the measurement surface by inputting vector information (I, J, K). It is characterized by that.

According to the measurement ability evaluation method or the like according to the embodiment of the present invention, it is possible to quantitatively determine whether or not the measurement result on the machine tool is truly correct, thereby improving the reliability of the measurement ability evaluation. It has the effect of being able to.

It is explanatory drawing explaining the structural concept of the system module, etc. which carries out the measurement capacity evaluation method which concerns on one Embodiment of this invention. Among the modules shown in FIG. 1, it is explanatory drawing explaining the structural concept of the submodule and the like in the measurement program generation module. It is a flowchart explaining the free-form surface measurement processing flow in the measurement ability evaluation method which concerns on one Embodiment of this invention. It is explanatory drawing explaining the example of the free-form surface which the measurement performed in the measurement ability evaluation method which concerns on one Embodiment of this invention is a target. It is explanatory drawing explaining the example of another free-form surface which the measurement performed in the measurement ability evaluation method which concerns on one Embodiment of this invention is a target. It is a flowchart explaining the processing flow in the measurement capacity evaluation method which concerns on one Embodiment of this invention. It is a flowchart explaining the processing flow in the measurement capacity evaluation method which concerns on one Embodiment of this invention. It is explanatory drawing explaining the output example which is output in the measurement ability evaluation method which concerns on one Embodiment of this invention.

The measuring ability evaluation method and the program according to the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a configuration concept of a system module or the like that implements the measurement capability evaluation method according to the embodiment of the present invention. These system modules and the like are premised on the following hardware (not shown in FIG. 1) in one embodiment.
[Hardware configuration example]
(1) Machine tools such as NC (3 to 6-axis machining center or multi-tasking machine)
(2) External terminal (PC, etc.)
For the machine tool, a measurement program generation module (in one embodiment, product name: NC gauge can be adopted) and statistical analysis software (in one embodiment, product name: O-QIS, SolaraMP can be adopted). Can be) is implemented. Alternatively, these software may be implemented in an external terminal such as a PC (in this case, the measurement data is sequentially transmitted from the machine tool to the external terminal).
In the following examples, the machine tool will be described by taking a multi-tasking machine in which the probe can rotate on the B axis as an example, but the present invention is not limited to this, and a machining center provided with a movable portion on the B axis. It is also applicable to.

Here, the measurement program generation module communicates via the API (Application Programming Interface) on the machine tool side. In addition, the statistical analysis software performs various processes for analyzing the results measured by the measurement program generation module.

In FIG. 1, the system module 100 includes a machine tool control module 110 mounted on a machine tool side such as NC and a terminal side module 120 mounted on a terminal side such as a PC. The machine tool control module 110 receives measurement signals from at least two types of probes connected to a machine tool (not shown) such as NC.

One of at least two types of probes is a probe 191 for measuring work shape. The other one is a probe 192 for measuring the temperature of the work.
A feature of the system module 100 in one embodiment of the present invention is that not only the measurement data from the probe for measuring the shape of the work but also the measurement data from the probe for measuring the temperature of the work is taken into consideration for processing (details). Will be described later).

A master gauge 199 is used as an example for calibrating the probe. Specifically, the probe used for measurement is registered in the measurement program generation module, and the probe is calibrated. The calibration result is used to correct the measurement result of the measurement program generation module. In the case of a 5-axis control machining center, it is also necessary to calibrate the rotation axis (the C-axis which is the fifth axis and the A-axis or B-axis which is the fourth axis).

The machine tool control module 110 includes a measurement program generation module 111 for receiving and processing measurement data from the work shape measurement probe 191 and a dedicated macro for receiving and processing measurement data from the work temperature measurement probe 192. It includes a program 112 and a macro variable generation module 113 that writes temperature information and the like in macro variables.

In one embodiment of the present invention, the macro variable related to the temperature generated by the module 113 such as macro variable generation is transmitted to the temperature correction module 112 in the terminal side module 120, and the measurement program is generated after the temperature correction processing (described later). By feeding back to the module 111, the reliability of the measurement capability evaluation can be improved.

In one embodiment of the present invention, the data processed by the measurement program generation module 111 is transmitted to the gauge capacity evaluation module 121 in the terminal side module 120, and the gauge capacity evaluation (described later) is performed.

FIG. 2 shows the constructs of the submodules and the like in the measurement program generation module among the modules shown in FIG. In FIG. 2, the sub-module 200 is a software module in which the machine tool side controller 201 has a macro 202, a measurement program generation module 203, and a three-dimensional measurement module (a software module capable of generating a measurement program offline from CAD data, and in one embodiment. , Product name: PC-DMIS NC etc. can be adopted) It is configured to control 204, and the data measured by these modules is converted into a predetermined data format by the conversion unit 205 and reported. It is transmitted to the module (trade name: O-QIS can be adopted in one embodiment) 206, the measurement result data is processed, and the report data is generated. Then, it is transmitted to the graphic analysis module 207 as needed, and the report information is visually displayed. At this time, it may be processed in real time according to the change of the report information.

FIG. 3 shows a free-form surface measurement processing flow in the measurement capability evaluation method according to the embodiment of the present invention. This flow is exemplified by the measurement program generation module, but the measurement program generation module generally executes the following operations and processes.
(1) Selection of work offset (2) Movement of rotation axis (3) Setting of safe height (4) Creation of measurement command (5) Saving of measurement command (6) Creation in (4) to (5) above Arbitrary execution of saved commands (all can be executed)
(7) Automatic command execution instead of (6) above

One of the features of the present invention is the free curved surface in the measurement program generation module (the effect is exerted on the free curved surface in one embodiment of the present invention, but the present invention is not limited to this. It has the function of accepting the input of vector information (I, J, K) when measuring (not to mention the same effect on a flat surface such as a slope) and requesting an accurate measurement point for the design value. .. The specific processing procedure will be described below.

When the measurement is started in step S301 of FIG. 3, the process proceeds to step S302, and the selection of the measurement surface (for example, the selection of the measurement surface in the measurement of points) is switched to the vector measurement mode. Next, the process proceeds to step S303, and the input of vector information (I, J, K) is accepted. The acceptance of this vector information is accepted, for example, as one of the designations of the orientation of the measurement surface in the measurement conditions of the measurement program generation module (the present invention is not limited to this, but the orientation of the measurement surface is accepted. As another specification, it is also possible to specify by angle).
Then, in one embodiment of the present invention, by acquiring this vector information (I, J, K), the measurement surface of the work (although it is not necessarily limited to the free curved surface, it is particularly effective on the free curved surface). Alternatively, it becomes possible to control so that the tip portion (for example, the tip sphere) of the work measurement probe is in direct contact with the plane including the measurement point.

Next, the process proceeds to step S304, and the input of the design value (X, Y, Z) of the measurement point is accepted. This design value is compared with the measured value (x, y, z) measured by the measurement program generation module (various evaluation processes can be adopted for this contrast, and statistical judgment processing is added. May be).

Next, the process proceeds to step S305, and as one embodiment, the upper tool post of the machine tool (where the work measuring probe is attached) measures the free curved surface of the work in a posture (angle) of 110 ° on the B axis. Here, the "posture in which the upper tool post is 110 ° on the B-axis" refers to the angle of the B-axis that enters the free curved surface of the work to be measured in one embodiment of the present invention. The posture position, which is fixed at 0 ° or 90 °, can be arbitrarily set. That is, in the machine tool according to the present invention, it is possible to measure a free curved surface at an arbitrary angle on the B axis.

一例として、上表のような出力を終えると、本フローとしては処理を終了する（ステップＳ３０７）。 Next, the process proceeds to step S306, and the value actually measured by the work measuring probe attached to the upper tool post is output. In one embodiment of the present invention, as shown in the following table, on a display unit on a machine tool or terminal (PC) (not shown) so as to be contrasted with design measurement points (X, Y, Z). Is displayed.

As an example, when the output as shown in the above table is completed, the processing is completed in this flow (step S307).

[Advantages in free-form surface measurement at arbitrary B-axis angle]
The advantages of the measurement processing flow shown in FIG. 3 are as follows.
(1) The design measurement point can be measured after the work is machined in the machine tool.
In the past, in order to measure a free-form surface with a machine tool, for example, it was essential to use software that captures CAD data. That is, it was necessary to measure and compare with a three-dimensional measuring machine after processing, but according to the measurement processing flow described with reference to FIG. 3, these problems are solved.
(2) The free curved surface can be measured at an arbitrary B-axis angle within the movable range of the axis.
In the machine tool according to the embodiment of the present invention, it is possible to measure a free curved surface in a posture in the range of 90 to 180 ° on the B axis with respect to the workpiece mounted on the first spindle and the second spindle. rice field.
(3) By changing the stylus, it is possible to measure a free curved surface in a place where measurement is difficult.
For example, by changing the stylus attached to the probe to a 100 mm type (standard is 50 mm), it is possible to measure even in a deep groove. As another example, by changing the stylus sphere to a φ2 type (standard is φ6), it is possible to measure a narrow area. Further, when a three-dimensional measurement module (trade name: PC-DMIS NC in one embodiment) is adopted, it is possible to use a cross-shaped stylus instead of the stylus sphere.

These advantages will be described in more detail with reference to FIGS. 4 and 5.

FIG. 4 shows an example of a free-form surface targeted for measurement performed in the measurement capability evaluation method according to the embodiment of the present invention. In FIG. 4, a specially shaped work 420 is gripped on the spindle 410 of the machine tool. Here, assuming that a predetermined point on the convex curved surface 421 of the work 420 is measured, the stylus attached to the tip of the probe 431 is changed from the standard (50 mm) stylus to the longer stylus (100 mm) 432, and the B-axis 110 The tip of the work measurement probe (tip sphere) approaches (contacts) the surface of the target free curved surface on the work in the ° posture, and measurement is performed.

Further, FIG. 5 shows an example of another free-form surface for which the measurement performed in the measurement ability evaluation method according to the embodiment of the present invention is targeted. In FIG. 5, a specially shaped work 520 is gripped on the spindle 510 of the machine tool. Here, assuming that a predetermined point on the concave curved surface 521 of the work 520 is measured, the stylus attached to the tip of the probe 531 has a sphere (φ2) smaller than that of the standard (φ6) tip sphere. The stylus is changed to 532, and the tip (tip sphere) of the work measuring probe approaches (contacts) the target free curved surface on the work in a posture of 140 ° on the B axis to perform measurement.

As described above, in the method for evaluating the measuring ability of the machine tool according to the embodiment of the present invention, various free curved surface shapes can be measured by changing the B axis to an arbitrary angle, so that multipoint measurement can be performed. It is also possible to grasp the overall tendency value of the curved surface shape on the machine tool.
Further, even in the case of a large workpiece that cannot be mounted on a three-dimensional measuring machine, there is an advantage that a free curved surface can be evaluated on the machine tool according to the embodiment of the present invention.

Further, in the method for evaluating the measuring ability of a machine tool according to an embodiment of the present invention, the reliability of the measurement result is further improved by adding the temperature correction of the work, and this point is described in detail with reference to FIG. Describe.

FIG. 6 shows a processing flow to which temperature correction is added in the measuring ability evaluation method according to the embodiment of the present invention. This flow is executed at an arbitrary timing before the measurement process of the master work in the gauge capacity evaluation process described later (of course, it may be executed in advance before the start of the gauge capacity evaluation process itself).
When the process is started in step S601, the process proceeds to step S602, and the work is measured by the measurement program generation module (as one embodiment, the position / shape data acquired by the work shape measurement probe 191 is collected). This measurement result is stored as a master dimension measurement result in a storage device (not shown) of the machine tool or the terminal.

Next, the process proceeds to step S603, and the work temperature is measured by a temperature probe (work temperature measuring probe 192 as an example). This measurement result is recorded in a macro variable as a temperature parameter.

上表によれば、例えば、材質Ｓ４５Ｃの温度１０℃のときの膨張率は、１．００２である（その他、特定材質の特定温度の場合の膨張率の見方についても同じである）。 Next, the process proceeds to step S604, and a conversion process by master dimension conversion based on temperature is performed. In the conversion process in this step, the above-mentioned macro variable (where the temperature parameter is written) and the conversion table based on the temperature and material are referred to. In one embodiment of the present invention, the expansion coefficient table as shown in the following table is adopted.

According to the above table, for example, the expansion coefficient of the material S45C at a temperature of 10 ° C. is 1.002 (the same applies to how to read the expansion coefficient of the specific material at a specific temperature).

Then, in the conversion process in step S604, as one embodiment,
(New masterwork dimension) = (Original masterwork dimension) x (Expansion rate)
The temperature correction process is performed on the master dimension by such conversion.

[Gauge capacity evaluation process]
FIG. 7 shows a gauge capacity evaluation processing flow in the measurement capacity evaluation method according to the embodiment of the present invention. The large flow of the present processing flow (outline of the flow in the upper concept) is in line with the conventional processing flow, but as described with reference to FIGS. 1 to 6, in one embodiment of the present invention, (1) Refer to the measurement data not only from the work shape measurement probe but also from the work temperature measurement probe. (2) In free curved surface measurement, use vector information (I, J, K) at an arbitrary angle on the B axis. The reliability of accuracy evaluation is improved by the original configuration and processing such as performing the measurement of (3) and performing the temperature correction processing by the masterwork dimensional conversion processing based on the temperature of the masterwork.
Hereinafter, the gauge capacity evaluation process in the measurement capacity evaluation method according to the embodiment of the present invention will be described with reference to FIG. 7.

When the process is started in step S701, the process proceeds to step S702, and the workpiece to be measured in advance is measured by the coordinate measuring machine. The measured result is input to the machine tool or the terminal.
The purpose of this is as follows. First, the gauge capacity evaluation evaluates the measurement capacity of a machine tool. This evaluation standard is defined in VDA5, which is one of the methods of MSA (Measurement System Analysis).
Cg / Cgk
Is adopted. Therefore, the workpiece to be measured in advance is measured by a three-dimensional measuring machine, and the dimensions of the part to be measured are confirmed. This work is called master work. If there is no master work, a master gauge (the one whose dimensions are determined in advance as a prototype) that is close to the measurement dimensions of the object to be measured may be used.

Here, in one embodiment of the present invention, the resolution of the machine tool can be confirmed. For example, since the resolution must be within 5% of the work requirement tolerance, if the resolution of the machine tool confirmed at this point exceeds the permissible range, the gauge capacity evaluation can be stopped (hereinafter, the resolution). Will proceed on the assumption that is within the permissible range).
Next, the process proceeds to step S704 to determine the tolerance used in the gauge capacity evaluation. This tolerance is 20% of the work requirement tolerance. Therefore, when the width of the work is 20.302 mm and the work required tolerance T is 0.24 mm, it is compared with the master work dimension of 20.302 mm with a tolerance of 0.2T = 0.048 mm in the gauge capacity evaluation. ..
The determination of these tolerances may be automatically determined and determined by referring to a reference table or the like (not shown), or may be manually determined by a user or the like. In the latter case, the determined tolerance is input to the machine tool or terminal.

Next, the process proceeds to step S705, and the measurement site of the master work is repeatedly measured 25 times or more. The measurement result is judged by comparing the value of the normal distribution with the tolerance set in the gauge capacity evaluation (step S706). In this case, various graphing processes are adopted, and FIG. 8 shows an example thereof.

Further, the index Cg obtained in step S706 is called repeatability and is expressed by the following equation.

Further, Cgk is an accuracy evaluation including bias and is expressed by the following equation.

Then, in step S707, the relationship between the above-mentioned Cg and Cgk is determined, and the relationship is determined.
When Cg / Cgk is 1.33 or more, the measuring ability is diagnosed as good (step S708), and when it is less than 1.33, the measuring ability is diagnosed as poor (step S709).
Further, although not shown in FIG. 7, it is also possible to present the minimum measurable tolerance in one embodiment of the present invention. For example, when Cg / Cgk is 1.88 (significantly larger than 1.33), there is a considerable margin, so the actual tolerance is calculated and presented. be able to.

Then, the process proceeds to step S710, and the present processing flow ends.

Although the embodiment of the measuring ability evaluation method of the machine tool according to the embodiment of the present invention has been described above based on the specific example, the embodiment of the present invention includes a method or a program for carrying out the evaluation. In addition, it is also possible to take an embodiment as a storage medium (for example, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a CD-RW, a magnetic tape, a hard disk, a memory card) on which a program is recorded. be.

Further, the implementation form of the program is not limited to the application program such as the object code compiled by the compiler and the program code executed by the interpreter, and may be in the form of a program module or the like incorporated in the operating system. good.

Further, the program does not necessarily have to perform all processing only on the CPU on the control board, and if necessary, an expansion board added to the board or another processing unit (DSP, etc.) mounted on the expansion unit. ) May be implemented in part or in whole.

These features are mutually exclusive for all of the components described herein (including claims, abstracts, and drawings) and / or for all steps of all disclosed methods or processes. Any combination can be combined except for the combination of.

Also, each of the features described herein, including claims, abstracts, and drawings, serves the same, equivalent, or similar purpose, unless expressly denied. Can be replaced with alternative features. Therefore, unless explicitly denied, each of the disclosed features is merely an example of a comprehensive set of identical or equal features.

Furthermore, the present invention is not limited to any of the specific configurations of the embodiments described above. The present invention describes all novel features or combinations thereof described herein (including claims, abstracts, and drawings), or all novel methods or processing steps described, or them. Can be extended to a combination of.

100 Measuring ability evaluation system module 110 NC machine tool control module (in NC)
111 Measurement program generation module 112 Dedicated macro program 113 Macro variable generation module 120 Terminal (PC, etc.) side module 121 Gauge capacity evaluation module 122 Temperature compensation module

Claims (6)

A method for evaluating the measuring ability of a machine tool among a system including a machine tool and a terminal connected to the machine tool.
The process of inputting the measurement result of the work to be measured in advance and
The process of determining tolerances and
A step of repeatedly measuring the measurement site of the master work a predetermined number of times using the work as a master work,
Including a step of comparing the result of repeated measurement a predetermined number of times with the tolerance.
In the process of comparison, it is determined whether or not the measuring ability of the machine tool is good.
The step of repeating the measurement a predetermined number of times includes measurement by the work measurement probe of the machine tool, and the measurement by the work measurement probe is the work measurement with respect to the measurement surface by inputting vector information (I, J, K). A method characterized in that control is performed so that the tip of the probe is in direct contact with the surface. At the stage until the step of repeating the measurement a predetermined number of times is started, the measurement by the work temperature measuring probe of the machine tool is further included, and in the measurement by the work temperature measuring probe, the master based on the measurement temperature of the master work is further included. The method according to claim 1, wherein the dimension conversion process is performed. In the master dimension conversion process, a table recording the material of the master work and the expansion coefficient for each temperature is referred to, and the value obtained by multiplying the original dimensions of the master work by the expansion coefficient with respect to the temperature is used as the new master work. The method according to claim 2, wherein the method is processed so as to have dimensions. Among the systems including a machine tool and a terminal connected to the machine tool, a program executed on the system for evaluating the measuring ability of the machine tool.
A step of causing the terminal to input the measurement result of the work to be measured in advance, and
The step of letting the terminal determine the tolerance,
A step of causing the machine tool to repeatedly measure the measurement site of the master work a predetermined number of times using the work as a master work.
The terminal executes a step of comparing the result of repeated measurement a predetermined number of times with the tolerance.
In the step of comparison, it is determined whether or not the measuring ability of the machine tool is good.
The step of repeating the measurement a predetermined number of times includes measurement by the work measurement probe of the machine tool, and the measurement by the work measurement probe is the work measurement with respect to the measurement surface by inputting vector information (I, J, K). A program characterized in that control is performed so that the tip of the probe is in direct contact with the surface. At the stage until the step of repeating the measurement a predetermined number of times is started, the measurement by the work temperature measuring probe of the machine tool is further included, and in the measurement by the work temperature measuring probe, the master based on the measurement temperature of the master work is included. The program according to claim 4, wherein the dimension conversion process is performed. In the master dimension conversion process, a table recording the material of the master work and the expansion coefficient for each temperature is referred to, and the value obtained by multiplying the original dimensions of the master work by the expansion coefficient with respect to the temperature is used as the new master work. The program according to claim 5, wherein the program is processed so as to have dimensions.

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