JP2017068630A - Control device of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent failure of a machine tool or reduction of a utilization rate due to forgetting to execute a periodical inspection.SOLUTION: There is provided a control device 11 of a machine tool comprising plural inspection items which have to be inspected periodically. The control device comprises: a counter 39 for counting an operation time for every inspection item; a setting storage part 31 for storing a periodical processing 35 which is processing performed by the machine tool, when the counting time of the counter reaches to a periodical inspection time 37; a display part 61 for notifying that a use ratio which is a ratio of the operation time to the periodical inspection time exceeds a threshold 33, when the use ratio is equal to or more than the threshold 33; and a periodical processing part 31 for performing the periodical processing 35 when the operation time reaches the periodical inspection time 37.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a machine tool control apparatus that improves the workability of periodic inspection.

  The machine tool includes a plurality of devices that require maintenance. If maintenance of these devices is neglected, the machine tool cannot exhibit its performance, which causes a failure of the machine tool or a defect of the workpiece. Therefore, a period is determined in advance, such as every day, one week, six months, etc., and these devices are regularly inspected and parts are replaced.

  In Patent Document 1, the operation time and the number of operations from the previous maintenance are measured, the operation rate of the equipment is calculated by the calculation unit, and the maintenance data stored in the storage unit and the measurement data of the measurement unit are used. It is disclosed that the maintenance time is calculated for each maintenance item, the maintenance time is predicted, and the operation of the equipment is stopped when the operation time or the number of operations reaches a set value.

  Patent Document 2 discloses that a threshold value is given for each consumable item as a percentage of the remaining life of the consumable item, and the life is determined.

JP-A-7-56620 Japanese Patent No. 5595559

  In the past, due to human error, it was sometimes forgotten to carry out periodic inspections. For this reason, the machine tool had a function to notify the inspection time for one week or six months, but the machine tool failed without stopping even if it was time for regular inspection at night or on holidays. Or cause defective workpieces. In addition, stocking unnecessary replacement parts for maintenance is recognized as useless at production sites, so replacement parts used for periodic inspections are not stocked by machine tool users. Since the necessary replacement parts were ordered from the manufacturer, there was a period during which the machine tool could not be operated until the replacement parts arrived.

  In particular, with water jet laser processing machines, in addition to inspection items that can lead to machine failure if neglected, inspections that cause work defects due to unstable water jet ejection, although not so much as failure. There were also items, and there were a wide variety of inspection items, and inspection omissions were likely to occur.

  In said patent document 1, the maintenance time is calculated for every maintenance item from an equipment operation rate. However, in the case of a machine tool, since the workpiece to be machined is changed, the operating rate of the equipment always changes. For this reason, even if the past operating rate is used for the calculation, the conditions are different, and therefore, it is not always possible to notify the correct maintenance time.

  In Patent Document 1, when the maintenance time is reached, the operation of the equipment is automatically forcibly stopped. Therefore, when the forced stop occurs automatically at night or on holidays, a period when the equipment is not in operation occurs, resulting in a decrease in productivity.

  The present invention has been made to solve the above-mentioned problems, and it is possible to minimize the reduction in the operation rate caused by stopping the machine tool in the periodic inspection and to forget to perform the periodic inspection. The purpose is to prevent both machine tool failure and defective workpieces due to technical mistakes.

  In order to achieve the above-described object, according to the present invention, in a machine tool control device having a plurality of inspection items that require periodic inspection, a counter that counts the operation time for each inspection item, and each inspection item In addition, the periodic inspection time, which is the time from the start of use until the periodic inspection is required, the threshold value set as a ratio to the periodic inspection time, and the processing performed by the machine tool when the periodic inspection time is reached. A setting storage unit that stores periodic processing, a calculation unit that calculates a ratio of operation time counted by a counter with respect to a periodic inspection time as a usage rate for each inspection item, and a threshold value when the usage rate is equal to or greater than the threshold value There is provided a control device for a machine tool that includes a display unit that notifies that the time has been exceeded, and a periodic processing unit that performs periodic processing when the operation time reaches a periodic inspection time.

  As a result, when the threshold value is exceeded, the operator can be urged to perform early maintenance even before the periodic inspection is reached, and the machine tool stops when the operator is absent, such as at night or on holidays. Can be prevented.

  Further, according to the present invention, the periodic processing unit includes a process for immediately ending the running machining program, a process for pausing the running machining program so that the machining program can be resumed from a paused position, and a running machining program. After completion, any one of the processes that do not execute the next machining program is performed.

  Thereby, the threshold value according to the risk of the inspection item of the machine tool can be set. For inspection items that are at risk of machine tool failure, select a process that stops machining of the workpiece as part of regular processing to ensure that the machine tool is protected. By selecting a process that does not stop the machine tool, it is possible to prevent a reduction in the operating rate of the machine tool.

  Further, according to the present invention, the display unit displays a list of a plurality of inspection items together with their usage rates, and further displays the inspection work method, operation time, and periodic inspection time of the selected inspection item.

  As a result, even for machine tools with many inspection items, the operator can reliably recognize inspection items that are close to the inspection time, forgetting to perform periodic inspections, and workpiece processing will stop unintentionally. Can be prevented.

  According to the present invention, the operator can easily recognize that the time for the periodic inspection is approaching, and the operator can easily determine whether to perform the periodic inspection ahead of schedule in accordance with a future work schedule. As a result, human error such as the operator forgetting the time for periodic inspections can be prevented, and the machine tool can be prevented from stopping during regular inspections on holidays and at night. There was an effect. In addition, since the time for periodic inspections is notified in advance, replacement parts can be ordered in advance before the time for periodic inspections is reached, preventing the occurrence of time when machine tools cannot be operated without replacement parts. There is an effect that the operating rate of the machine is improved. And it is possible to prevent machine tool failures and machined work defects from occurring.

It is a block diagram which shows a pure water supply apparatus. It is a block diagram of a control device of a machine tool in an embodiment of the present invention. It is a setting table | surface of the inspection item stored in a setting memory | storage part. It is an example of the display of a display part. It is a control flow figure in an embodiment of the invention.

  A water jet laser processing machine will be described as an example of a machine tool 71 to which the present invention can be applied. The water jet laser processing machine relatively moves the table on which the workpiece is placed and the laser head, and jets the water jet in a laminar column shape with high pressure from the nozzle 99 provided in the laser head to hit the workpiece. This is a machine tool that introduces a laser beam sent from a laser oscillator 83 into the pillar of the water jet, guides the laser beam to a workpiece processing site, and removes the workpiece with heat from the laser beam. As the water jet ejected from the laser head, pure water is used to prevent the energy of the transmitted laser light from being lost by impurities in the water. Therefore, a pure water supply device 81 is provided.

  The pure water supply device 81 shown in FIG. 1 pressurizes the city water or tap water filtered in advance by the pre-filter 83 and the activated carbon filter 85 by the pump 87 and supplies it to the reverse osmosis membrane device 89. Highly filtered at 89, and then passed through an ultraviolet sterilizer 91, after which impurities are further removed by the ion exchange resin 93 to produce pure water. The pure water generated in this way is stored in the tank 95 and then supplied by the pump 97 toward the nozzle 99 of the laser head via a pipe line. These inspection items such as filters and pumps used in the deionized water supply device are required to perform different periodic inspections.

  The above equipment has a number of inspection items that should be regularly inspected and replaced as necessary. For example, the various filters incorporated in the pre-filter 83 and the activated carbon filter have different lifetimes and require periodic inspection. If the filter is clogged, it is necessary to replace it with a new filter. If the filter is not exchanged, impurities contained in tap water or the like will cause rust in other parts of the pure water supply device 81 and the machine tool 71, or bacteria will grow and cause failure. Also, RO membrane (reverse osmosis membrane) is used for the reverse osmosis membrane device 89 and UV lamps are used for the UV sterilization device 91. The pump 97 has a high-pressure pump as an inspection item. The high-pressure pump is used to apply a high pressure to water, but is consumed because the pressure is high. If a failure occurs, high-pressure water cannot be ejected from the nozzle 99 and the workpiece cannot be processed.

  Next, the control device 11 of the present invention will be described. As illustrated in FIG. 2, the control device 11 includes an input unit 21, a setting storage unit 31, a calculation unit 41, a regular processing unit 51, and a display unit 61. The input unit 21 is an operation panel for operating the machine tool 71 and includes a keyboard, a switch, and a touch panel display. The input unit 21 inputs and selects a machining program, operates the machine tool 71, and inputs various parameters. be able to. The setting storage unit 31 is a device that stores various parameters of the machine tool. The regular processing unit 51 controls each device of the machine tool based on regular processing determined for each inspection item. The display unit 61 is an operation panel of the machine tool 71 together with the input unit 21 and includes a display, and displays the input machining program, the state of the machine tool 71, various parameters, and the like. The display unit 61 can also serve as a touch panel display of the input unit 21.

  The setting storage unit 31 stores various parameters necessary for giving a command to the machine tool 71. As shown in FIG. 3, in the present invention, a threshold 33, a regular process 35, a regular The inspection time 37 and the operation time counted by the counter 39 are stored. The regular inspection time 37 refers to a predetermined time from when the inspection item is started to be used until the regular inspection becomes necessary. For example, when a filter is replaced, the time required for periodic filter maintenance (for example, check for filter clogging or filter replacement) is counted as the periodic check time 37 immediately after replacing the filter as 0 o'clock. Remember. The regular inspection time 37 is a time determined when the device or machine tool is designed. The periodic process 35 is a process to be performed on an inspection item that has reached the periodic inspection time 37, and any one of three types of processes of an alarm, a warning, and a cycle stop is set. The periodic processing 35 is set such that an inspection item that causes serious damage to the machine tool 71 when an exchange or inspection is not performed is set as an alarm, or the machining accuracy falls within an allowable range even if the inspection is slightly delayed. On the other hand, a warning is set for an inspection item with a slight damage to the machine tool, or it is determined in advance according to the importance of replacement or inspection. The counter 39 counts and stores the operation time for each inspection item that has passed so far. For the threshold value 33, the operator sets a desired value in advance from the parameter setting unit 23 of the input unit 21. The threshold 33 may be set to be large for inspection items with a long periodic inspection time 37, small for inspection items with a short periodic inspection time 37, and small for inspection items using maintenance parts that take time from ordering to delivery.

  FIG. 4 shows an example of display on the display which is the display unit 61. In the machine tool 71 according to the embodiment of the present invention, a touch panel display is used as the display, and the function of the input unit 21 is also provided. The display unit 61 of the machine tool 71 can be switched to the display of the function that the operator wants to use in order to display a wide variety of information. FIG. 5 shows the state when the display of consumables management is selected. is there. When display of consumables management is selected, a list of inspection items is displayed on the left side of the display unit 61. In addition, the current usage rate is displayed for each inspection item beside the inspection item. The usage rate indicates the ratio of the operation time to the regular inspection time 37 for each inspection item in%.

  On the upper right of the display unit 61, the state of the inspection item selected from the list of inspection items is displayed. In the example of FIG. 4, the high-pressure pump used for the pump 97 is selected by the cursor 63, and the last inspection date that is the date of the previous inspection as the inspection item high-pressure pump state is displayed in the upper right of the display unit 61. Is displayed on April 22, 2015. In addition, a numerical value and a bar graph indicate that the operation time is 3800 hours and the periodic inspection time 37 is 4000 hours. Further, a “check completed” button as the zero setting unit 25 is displayed. When this “inspection complete” button is pressed on the touch panel, the record of the high-pressure pump counter, which is the inspection item being selected, returns to zero.

  In the lower right of the display unit 62, the position of the machine tool 71 where the device corresponding to the selected inspection item is located is shown, and the inspection work procedure and work precautions are displayed.

  The control flow of the present invention will be described with reference to FIG. When the machine tool 71 including the inspection item starts to operate, the counter 39 starts counting the operation time, and continues counting while the device is operating (S001). When the machine tool 71 is not operating and only the device including the inspection item starts operating (for example, in the case of the pre-filter 83 and the activated carbon filter 85, the pure water supply device 81 starts operating) Only the inspection item counter 39 included in the apparatus may count. Thereby, the counter 35 counts and memorize | stores the driving | operation time for every inspection item. Next, for each periodic inspection item, the periodic inspection time 37 stored in the setting storage unit 31 is compared with the operation time stored in the counter 39 (S002). If there is an inspection item whose operation time stored in the counter 39 is equal to or greater than the periodic inspection time 37 in the process of S002, according to the periodic processing 35 of the inspection item stored in the setting storage unit 31. Predetermined processing is performed (S003).

  When the periodic process 35 is “alarm”, the machining program being executed is terminated (stopped) and the machine is stopped when the operation time becomes equal to or greater than the periodic inspection time 37 (S004).

  When the periodic processing 35 is “warning”, the machining program being executed is temporarily stopped when the operation time reaches a value equal to or greater than the regular inspection time 37, and the operator performs a periodic inspection. It will be in a standby state until it is instructed to resume (S005). In the case of “warning”, if the resumption of the machining program is instructed after the periodic inspection is completed, the machining is continued from the point where the pause was made.

  When the periodic process 35 is “cycle stop”, the machining program that has been executed is executed to the end even when the operation time is equal to or greater than the periodic inspection time 37, but the next machining program is executed. Is not accepted (S006). After confirming that the periodic inspection is complete, the next machining program can be executed.

  Next, the usage rate, which is the ratio of the operation time to the periodic inspection time 37, is obtained, and the usage rate is compared with the threshold value 33 (S007). If the usage rate is equal to or greater than the threshold value in the process of S007, a forecast mark 65 in which “!” Is surrounded by a triangle is added to the left side of the usage rate of the inspection item list on the display unit 61, and it is easy to find from the list. (S008).

  In step S009, the operator performs inspection / maintenance of the corresponding device in response to an alarm, warning, or cycle stop state. Alternatively, by looking at the forecast mark 65, ordering replacement parts or performing an inspection work early in consideration of a schedule for unmanned operation such as a holiday or nighttime in the future.

  The process of S010 is a process of detecting that the “inspection complete” button of the zero setting unit 25 has been pressed. When the operator presses the “inspection complete” button after completing the inspection work, the control device of the machine tool 71 recognizes that the inspection work is completed, and returns the counter 39 to zero. (S011)

  The present invention can be applied to various machine tools, but is most suitable for a water jet laser processing machine. Other machine tools such as machining centers and electric discharge machines are processed while the outer shape of the end mill and the electrode is transferred to the workpiece, and the end mill and the electrode are frequently replaced with new ones. However, in the water jet laser processing machine, when the shape of the columnar water jet ejected from the nozzle is disturbed, the laser beam passing through the interior does not reach the processing point well, and stable processing cannot be performed. In other words, periodic inspections in a water jet laser processing machine are very important, as are end mill dimension management in machining centers and electrode dimension management in electric discharge machining. Therefore, if the tool is measured at the machining center and the tool is missing, the water jet laser processing machine will perform machining when the water jet cannot be stably ejected, just as if the program was interrupted and the tool replaced immediately. Processing must be resumed after stopping the program and inspecting and maintaining the equipment for ejecting the water jet. In addition, regular inspection is usually required so that the water jet cannot be stably ejected.

  In the present invention, the inspection items are further classified into three types. One is an inspection item that causes serious damage to the machine tool, and should be processed for an alarm that immediately stops the operation of the machine tool. One is an inspection item that may cause damage to the machine tool if accumulated, and may adversely affect the machining result of the workpiece, and is an inspection item that should be processed for a warning that is interrupted so that the machining program can be resumed. This is similar to replacing a missing tool in a machining center. The last one is an inspection item that should have a cycle stop process that waits for the end of the machining program.

  According to the machine tool control apparatus of the present invention, the machine tool can be prevented from malfunctioning, and in particular, in a water jet laser processing machine, work defects in the work can be prevented, and periodic inspection is performed without reducing the operating rate of the machine tool. be able to.

DESCRIPTION OF SYMBOLS 11 Control apparatus 21 Input part 31 Setting memory | storage part 33 Threshold value 35 Periodic process 37 Periodic inspection time 39 Counter 41 Calculation part 51 Periodic process part 61 Display part 71 Machine tool 81 Pure water supply apparatus

In order to achieve the above-described object, according to the present invention, in a machine tool control device having a plurality of inspection items that require periodic inspection, a counter that counts the operation time for each inspection item, and each inspection item In addition, the periodic inspection time, which is the time from the start of use until the periodic inspection is required, the threshold value set as a ratio to the periodic inspection time, and the processing performed by the machine tool when the periodic inspection time is reached. a setting storage unit that stores a periodic process, each inspection item, a calculation unit for calculating a ratio of the operation time counted by the counter for the periodic inspection time as usage, the utilization, set for each inspection item when it has been at the threshold value or more, and a display unit indicating that exceeds the threshold value, for each inspection item, when the operating time has reached the periodic inspection time, regular process for the regular process When the control device for a machine tool provided with the are provided.

Claims (4)

In a machine tool control device having a plurality of inspection items that require periodic inspection,
A counter that counts the operation time for each inspection item;
For each inspection item, the periodic inspection time, which is the time from the start of use to the time when periodic inspection is required, the threshold value set as a percentage of the periodic inspection time, and the machine tool when the periodic inspection time is reached A setting storage unit that stores periodic processing that is processing;
For each inspection item, a calculation unit that calculates a ratio of operation time counted by the counter with respect to the periodic inspection time as a usage rate;
When the usage rate is equal to or higher than the threshold, a display unit that notifies that the threshold has been exceeded;
A periodic processing unit for performing the periodic processing when the operation time reaches the periodic inspection time;
A machine tool control device comprising:   The periodic processing unit includes a process for immediately ending a running machining program, a process for pausing a running machining program so that the machining program can be resumed from a paused position, and a next machining program after the running machining program is finished. The machine tool control device according to claim 1, wherein any one of the processes that do not execute is performed.   2. The machine tool according to claim 1, wherein the display unit displays a plurality of inspection items together with respective usage rates, and further displays an inspection operation method, the operation time, and the periodic inspection time of the selected inspection item. Control device.   The machine tool control device according to any one of claims 1 to 3, wherein the machine tool is a water jet laser processing machine and includes an inspection item of a pure water supply device that generates a water jet.

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