JP7167607B2 - Machine Tools - Google Patents

Description

The present invention relates to machine tools such as machining centers.

When a machine tool is automatically operated to machine a plurality of workpieces, and when machining defects occur in the workpieces due to tool failure such as breakage, it takes time and labor to inspect all the workpieces machined by the tool. Therefore, in Patent Document 1, a recording means is provided for recording the work number, machining program number, tool magazine number, tool use start and end time, presence or absence of tool abnormality, etc., which are transmitted from the control means of the machine tool. An invention of a machining result recording device is disclosed that displays a magazine number or the like related to a tool specified by information indicating that there is a tool abnormality as an abnormal tool list, and a workpiece machined by the tool as a work list.

Japanese Patent No. 3699874

By installing the machining performance recording device in a personal computer or the like installed separately from the machine tool, it is possible to centrally manage the machining performance of a plurality of machine tools.
However, when a machining trouble occurs with a machine tool, the operator must move from the machine tool to a personal computer or the like one by one and check the information in the machining record recording device, which is troublesome.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a machine tool capable of easily confirming information related to machining troubles.

In order to achieve the above object, the invention according to claim 1 provides, when machining a plurality of workpieces using a tool, workpiece identification information for identifying each workpiece, at least tool information for machining each workpiece, and machining tool information for identifying each workpiece. Machining history creating means for creating machining history data by associating date and time information with machining program information, storage means for storing machining history data created by the machining history creating means, and workpiece identification information or tool information can be specified. and display means for extracting and displaying machining history data related to the specified work identification information or tool information when the work identification information or tool information is specified by the input means. When a tool is replaced, the runout amount of the tool after the replacement is measured, and the measured runout amount is compared with a preset threshold value to automatically judge whether the tool is good or bad after replacement. Further comprising shake detection means, the input means is capable of inputting setting information including a threshold value for the shake detection means, the storage means is capable of storing determination results by the shake detection means, and the display means is capable of storing. The determination result stored in the means can be displayed .
According to a second aspect of the invention, in the configuration of the first aspect, the memory means can store the difference from the threshold as well as the quality of the tool after replacement as the judgment result. .

According to the first aspect of the invention, since the machine tool itself can store and display the created machining history data, it is possible for the machine tool itself to search for the history of which work was machined and when. Therefore, it is possible to easily check the information related to the processing trouble in a short time.
In addition to the effects described above, the machine tool itself can perform settings related to the shake detection means without connecting an external personal computer, and the machine tool itself can monitor the determination results.
According to the second aspect of the invention, in addition to the effect of the first aspect, the machine tool itself can confirm the details of the determination result of each tool.

1 is a schematic diagram of a machining center; FIG. FIG. 10 is a flowchart of a program activation history saving process; FIG. FIG. 10 is a flowchart of a program activation history saving process; FIG. FIG. 4 is an explanatory diagram of a menu screen; FIG. 11 is an explanatory diagram of a display screen of a program activation history; FIG. 10 is an explanatory diagram of an individual management search screen; FIG. 10 is an explanatory diagram of a screen for setting the number of rotations and the threshold value in the tool shake detection device; It is a flow chart of saving processing of the setting information in the tool shake detection device. It is a flow chart of the shake amount detection processing in the tool shake detection device. FIG. 11 is an explanatory diagram of a display screen of a tool shake detection history; FIG. 11 is an explanatory diagram of a display screen of a tool counter; FIG. 11 is an explanatory diagram of a display screen of a tool counter change history;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram of a machining center as a machine tool. In addition to a well-known NC device 2 and PLC device 3, the machining center 1 includes an HMI (Human Machine Interface) device 4 and an eddy current sensor 5 for detecting tool deflection. is provided. The HMI device 4 includes a keyboard, touch panel, mouse, etc. as input means from the operator side, and monitors, meters, lamps, speakers, etc. as information transmission means from the machine tool side.
The NC unit 2 controls the spindle, feed axis, ATC, etc. via the PLC unit 3 to machine the work, and when the work is machined with a predetermined tool, a work ID for identifying the work, a tool identification It also has a function as machining history creating means for creating machining history data in which the tool number, machining program, and machining date and time information as information are associated with each other, and storing the data in the storage section 2a as storage means. The NC unit 2 also functions as a tool data creating means for creating tool data in which a tool number is associated with a set value relating to the life of the tool and a count value of the actual number of times of use, and stored in the storage unit 2a. I have. The machining history data and tool data can be output to a monitor serving as display means according to commands from the input means of the HMI device 4 .

The eddy current sensor 5 is provided in the vicinity of the spindle and measures the deflection amount of a tool holder attached to the spindle by an ATC (not shown). It constitutes a vibration detection device. The measured amount of deflection is compared with a preset threshold value to determine whether the measured tool held in the tool holder is good or bad (whether or not it can be used). As a result, it is possible to prevent machining defects caused by tilting of the tool holder caused by chips caught between the spindle and the tool holder.
In the storage unit 2a here, it is possible to register setting information such as registration of tool holders and tools and threshold values via input means of the HMI device 4, as will be described later. In addition, the history of determination results can also be stored in the storage unit 2a and output to the monitor by a command from the input means of the HMI device 4. FIG.

In the machining center 1 configured as described above, when a workpiece is machined, a program activation history is stored based on the flow charts of FIGS.
First, when a work is loaded in S1 of FIG. 2, the work ID is read from the recognition tag of the work by a reading device (not shown) in S2, and the read work ID information is stored as an individual management number in S3. .
Then, when the machining of the workpiece is started in S11 of FIG. 3, the machining program being executed is read from the NC unit 2 in S12, and the execution date and time of machining and the machining program number are stored in the storage unit 2a in S13. stored in Then, in S14, the date and time of machining and the machining program number are linked to the individual management number of the machined workpiece and stored as machining history data.

FIG. 4 shows an example of the menu screen of the monitor in the HMI device 4. Various operation buttons are displayed on the monitor, and the operation is performed by touching the operation buttons of the monitor, which is a touch panel and also serves as input means. It is possible. Here, an operation status display button 10 for displaying the operation status, an abnormality alarm button 11 for generating and displaying an abnormality alarm, a program activation history display button 12 for displaying the activation history of the machining program, displacement amount of the tool holder (displacement amount of the drawbar). ), a runout detection history display button 13 for displaying the runout detection history of the tool, a tool counter button 14 for displaying the number of times the tool has been used, and a runout detection button 15 for registering setting information of the tool runout detection device. ing.

For example, when the program activation history display button 12 is touched on the menu screen, as shown in FIG. 5, the date, time, individual control number which is work ID information processed at that time, and processed program number are listed in reverse chronological order. Is displayed.
Then, when it is desired to inquire about information on a specific work, such as when a defective work has occurred, by touching the individual management number search button 16 displayed in FIG. A screen 20 pops up. Therefore, when the operator inputs the individual control number, a related list including detailed information related to the input individual control number, that is, the tool number, machining date, machine number, etc., is created and displayed on the monitor. From this related list, the machine number and tool number that processed the defective product, and the date of processing can be identified.

On the other hand, in the tool run-out detection device, setting information such as the tool holder to be used for the spindle, the tool to be attached to the tool holder and used, and the threshold value for determining run-out detection for each tool are input and stored in advance. It can be performed by the machining center itself via the monitor of the HMI device 4.
For example, to register tools and thresholds, when the vibration detection button 15 is touched on the menu screen in FIG. 4, as shown in FIG. A list of possible settings is displayed.
The method of registering this setting information will be explained based on the flowchart of FIG. 8. First, in S21, the tool number to be used, the number of revolutions, and the threshold value are input from registration No. 1 of FIG.
Then, in S22, when the tool with the input tool number is attached to the spindle and the sensor adjustment button 17 in FIG. 7 is touched, the spindle rotates at the input number of rotations to adjust the sensor. In S23, if the input threshold value for the amount of vibration measured here is appropriate, when the OK button 18 is touched, the setting information is stored in S24. In FIG. 7, the measured shake amount 19 is also displayed together with the threshold value. Once this is done for all the tools, the setting work is complete.

With this tool run-out detection device, run-out detection is automatically performed when the tool is replaced by ATC. That is, in the flowchart of FIG. 9, when the shake amount is detected in S31, it is determined in S32 whether or not the detected shake amount exceeds the threshold value set for the tool number. If not, normal processing (determined as OK) is performed in S33, and the work is machined as it is. On the other hand, if it is determined in S32 that the shake amount exceeds the threshold value, error processing (determined as NG) is performed in S34, and abnormal stop is performed.
Then, in S35, the detected vibration amount information and the determination result are stored, and are stored in association with the individual management number of the processed work in S36.

Therefore, if the shake detection history display button 13 is touched on the menu screen, a list of the tool number used, the threshold value, and the judgment result (OK/NG) is displayed for each individual control number, as shown in FIG. . In FIG. 10, the drawbar detection history is also displayed, and the shake detection history for each individual management number is displayed as "Swing 1", and the drawbar detection is displayed as "Draw". Here too, when the individual control number search button 16 is touched, the individual control search screen 20 pops up in the same way as in FIG. A related list containing number, processing date, machine number, etc. is created and displayed on the monitor. From this related list, the machine number and tool number that processed the defective product, and the date of processing can be identified.

On the other hand, when the tool counter button 14 is touched on the menu screen, as shown in FIG. 11, for each tool, the number of times of use so far, the set number of replacement times, and a notice before reaching the set number are displayed. In this case, a list of the number of times to be subtracted from the set number (advance notice) and the like is displayed.
The values in each table, including the number of uses and the number of settings, can be arbitrarily changed by selecting the corresponding column or reset by operating the reset selection button, but here we will change each value and reset are stored as change history.
This change history can be displayed as a list as shown in FIG. 12 by touching the tool counter change history display button 21 . The parts related to changes and resets are displayed side by side with the values before the change along with the date and time, so that the change history can be grasped at a glance.

In FIG. 12, the number of uses of the tool of tool code 1 is reset (history number 1), and the previous history of changes in the number of uses is left (history number 2). In addition, the number of tool uses of tool code 22 is reset (history number 3), and a history of changes in the number of tool uses of tool code 6 and tool code 3 is left (history numbers 4 and 5). Furthermore, a history of changes in the set number of tools of the tool code 22 is also left (history number 5).
History numbers 7 and 8 contain histories of changes in the tool code. History numbers 9 to 13 contain histories of changes in the number of uses and the number of settings.

Thus, according to the machining center 1 of the above embodiment, when machining a plurality of workpieces using a tool, the workpiece identification information (individual management number) that identifies each workpiece is combined with the tool information that machined each workpiece and the machining machining history creating means (NC device 2) for creating machining history data by associating date and time information with machining program information; storage means (storage unit 2a) for storing machining history data created by the NC device 2; An input means (HMI device 4) capable of specifying an individual control number, and a display means for extracting and displaying processing history data related to the specified individual control number when the individual control number is specified by the HMI device 4. (HMI device 4), the machining center 1 itself can retrieve the history of which product was machined and when. Therefore, it is possible to easily check the information related to the processing trouble in a short time.

In particular, the eddy current sensor 5 measures the amount of runout of the tool, compares the measured amount of runout with a preset threshold value, and determines the quality of the tool (tool runout detection device). In addition, the HMI device 4 is capable of inputting setting information including a threshold value for the tool runout detection device, the storage unit 2a is capable of storing the determination result of the tool runout detection device, and the HMI device 4 is capable of: Since the determination results stored in the storage unit 2a can be displayed, the machining center 1 itself can perform settings related to the tool vibration detection device without connecting an external personal computer, and the machining center 1 itself can monitor the determination results. can do.
Further, since the storage unit 2a can store the difference from the threshold as well as the quality of the tool as the judgment result, the machining center 1 itself can confirm the details of the judgment result for each tool.

According to the machining center 1 of the above embodiment, when machining a plurality of workpieces using a tool, the tool identification information for identifying the tool is associated with the set value related to the life of the tool and the count value of the actual number of times of use. tool data creation means (NC unit 2) for creating tool data created by the NC unit 2; storage means (storage unit 2a) for storing the tool data created by the NC unit 2 and the change history when the tool data is changed; and display means (HMI device 4) for displaying data and change history, so that the machining center 1 itself can easily check the tool data including the change history of the set values and count values related to the tool life. can.

In the above embodiment, the storage unit of the NC device is used as storage means, but the storage unit of the PLC device may also be used.
Further, although the machining history data can be retrieved from the individual management number, it may be possible to retrieve the machining history data from the tool information such as the tool number.
Further, the machine tool is not limited to a machining center, and the present invention can be applied to other machine tools such as a multitasking machine.

1 Machining center 2 NC device 3 PLC device 4 HMI device 5 Eddy current sensor 10 Operating state display button 12 Program activation history display button 13 Shake detection history display button 14 Tool counter button 15 Shake detection button 16 Individual management number search button 19 Shake amount 20 Individual management search screen 21 Tool counter change history display button.

Claims (2)

When machining a plurality of workpieces using a tool, machining history data is created by associating at least the tool information that machined each workpiece, the machining date and time information, and the machining program information with the workpiece identification information that identifies each workpiece. a machining history creating means to create;
a storage means for storing the machining history data created by the machining history creating means;
input means capable of specifying the workpiece identification information or the tool information;
display means for extracting and displaying the machining history data related to the specified work identification information or the tool information when the work identification information or the tool information is specified by the input means. become,
When the tool is replaced, the run-out amount of the tool after the replacement is measured, and the measured run-out amount is compared with a preset threshold to automatically determine whether the tool is good or bad after the replacement. further comprising shake detection means for
the input means is capable of inputting setting information including the threshold value for the shake detection means;
The storage means can store the result of determination by the shake detection means,
The machine tool , wherein the display means can display the determination result stored in the storage means . 2. The machine tool according to claim 1 , wherein said storage means can store the difference from said threshold value together with the quality of said replaced tool as said determination result.

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