JPH0639348U - Cutting tool replacement time notification device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable exchange management of multiple cutting tools used in machine tools for each tool. [Structure] Thumbwheel switch 6 for setting the tool number of each cutting tool of the machine tool and the number of usable machining of that tool,
6 ', LED lamp 10 for notification and alarm buzzer 11
Are provided in the microprocessor 1 to which the M signal of the machine tool is input as the operation signal S _G , and the microprocessor 1 counts the operation signal of the machine tool, and the counted value and the thumbwheel switches 6, 6 ′. LED lamp 10 and alarm buzzer 11 when the number of usable processing set in
Informs the tool replacement time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutting tool replacement timing notification device that notifies the replacement timing of each cutting tool of a machine tool that uses a plurality of cutting tools such as NC lathes and automatic lathes for processing.

[0002]

[Prior art]

 Generally, it is said that 70% or more of machine troubles in machine tools such as NC lathes and automatic lathes are caused by breakage of cutting tools. In addition, when the troubles such as mechanical damage caused by it are included, it is considered that the above troubles will reach 80% or more.

For this reason, for example, in a numerical control device (CNC) having a plurality of cutting tools, in a machining routine of a numerical control program (NC program), the time during which the cutting tool is involved in machining is calculated for each tool, and A value is cumulatively added each time one machining routine is executed, and the cumulatively added time is compared with a preset life time for each tool to determine the tool life.

[0004]

[Problems to be solved by the device]

 However, the tool life determination of the above numerical control device has a problem that the actual tool life cannot be determined.

The cutting speed for the workpiece in the machining routine is not always constant, and the cutting speed is high or low. However, in the above life judgment, at high cutting speed, the cutting load of the tool used increases, but the machining time is not added according to the increase of the load. The product will be used significantly over the range, resulting in dimensional variations in the processed product and defective finished surface roughness, which may result in defective products.

On the contrary, in a place where the cutting speed is low, a cutting load commensurate with the machining time is not applied to the tool used, and therefore, the tool is not used until it reaches the end of its life, and the tool is quickly and quickly used. It will be exchanged, which may cause a large waste.

[0007] Therefore, an object of the present invention is to properly manage exchange of each tool attached to a machine tool.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, in the present invention, an input means for inputting an operation signal indicating that one working process of a machine tool having a plurality of cutting tools has been performed, and an operation input to the input means. Counting means for counting the signals, switch means for setting a value obtained by converting the cutting life of each of the plurality of cutting tools into the number of usable times in one working step of the machine tool, and the switch means When the set number of times each tool can be used reaches the number of times the counting means counts, the comparison means that outputs an alarm output and the alarm output from the comparison means are used to change each tool. Is configured to include an informing means for informing.

[0009]

[Action]

 With the cutting tool replacement timing notification device configured in this way, the life time of each tool, which takes into account the cutting speed level of the machining routine and usage conditions, is converted into the number of usable workpieces for each tool. The converted number of machining operations and the corresponding number of machine tool operations for each tool are compared with the actual number of machine tool operations. If they match, an alarm is issued for each tool to notify the tool replacement time.

[0010]

【Example】

 An embodiment of this invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, the cutting tool replacement timing notification device of the present invention is a microprocessor (hereinafter referred to as MPU) 1 housed in a case C and a data input connected to the MPU 1. The switch circuit 2, the display circuit 3, the notification circuit 4, and the operation switch circuit 5.

The data input switch circuit 2 is, as shown in FIG. 2, a thumbwheel (rotary) switch 6, 6 ′ for setting the tool number and the number of times the tool is used, which is provided on the display panel P on the front surface of the case C. And a write switch 7 for reading the data set in the switches 6 and 6'into the MPU 1 and their interface circuit 17. In addition to the thumbwheel switches 6 and 6'used in this embodiment, a keyboard switch or the like can be used as the switch 2.

The display circuit 3 includes a four-digit LED display 8 provided on the display panel P for each tool and a display driver (having a decoding circuit) 9 for the display 8. 9 dynamically lights the LED display 8.

Although the LED display 8 is used in the embodiment, a CRT or a liquid crystal display device may be used for the display circuit 3.

The notification circuit 4 comprises a warning LED lamp 10 and a warning sound generating buzzer 11 arranged in parallel on the LED display 8 for each tool on the display panel surface P. These are I / O interfaces. It is connected to the MPU 1 via 12. Further, the notification circuit 4 may be provided with, for example, a relay output circuit or the like for operating the machine tool and outputting an operation stop signal in cooperation with the LED lamp 10 and the buzzer 11.

The operation switch 5 includes a reset switch 13 for data resetting provided for each tool, and an operation selection switch 14 for selecting counting of the number of machining for each tool and stop of the counting. Which are connected to the MPU 1 via the interface 12.

On the other hand, in addition to the circuits described above, the MPU 1 is supplied with a memory circuit 15 including a RAM memory for data storage and a ROM memory in which a processing program is written, and an operation signal S _G from the machine tool. For example, an input signal interface circuit 16 using a monostable multivalve or the like as a pulse shaper is provided.

The operation signal S _G is generated by decoding a program command, which is a so-called M signal (M03, M05), which is used when rotating and stopping the spindle in a machine tool such as an NC lathe. However, an operation pulse is output each time one machining routine of the lathe is completed. Further, as the operation signal S _G , a driving signal of the cutting oil pump or the like may be used instead.

This embodiment is configured as described above, and its usage will be described below.

Prior to use, the present apparatus takes out, as an operation signal S _G , an M signal of an NC lathe or the like or a drive signal of a cutting oil pump through a connecting line, and the connecting line is input to the input signal interface circuit 16. Connecting. Next, turn on the operation selection switch 14 of the display 8 to be used, input the number attached to the tool for setting the replacement time to the thumbwheel switch 6 for setting the tool number, and further use the thumbwheel for setting the number of times of use. Into the switch 6 ', the number N of usable machining lines with respect to the life time of the tool, which is calculated by taking into account the high and low cutting speed in the machining routine of the tool, is inputted.

Then, when the number of pieces to be machined is sequentially set for each tool in this manner, the light switch 7 is operated to read the data into the MPU 1. Then, the MPU 1 stores the above-mentioned data in the memory area of the memory circuit 15 corresponding to the tool number, and at the same time, stores the data in the arithmetic register corresponding to the tool number, and stores the contents of the register in the tool number. Is displayed on the display circuit 3 corresponding to. In this way, after setting the life data of each tool sequentially for all tools, when the NC lathe is operated, the machining process is performed once, and the MPU1 outputs the M signal each time the M signal is output from the NC lathe. , The data in each register is subtracted one by one, and the subtracted data is displayed on the display unit 8. When the data in one of the registers becomes “0”, the indicator lamp 10 of the tool corresponding to that register is turned on or blinking, and the buzzer 11 emits an alarm sound to warn the user and inform them of the tool replacement time. To do.

When the notified tool is replaced, when the reset switch 13 corresponding to the replaced tool is operated, the MPU 1 reads the data from the memory area corresponding to the tool number, The data is restored (reset) to the register corresponding to the exchanged tool. This data is naturally also displayed on the display 8 corresponding to the tool number. That is, the data stored in the shared memory circuit is reset and displayed in the register corresponding to the reset switch 13 each time the reset switch 13 is subsequently operated.

By the way, when, for example, the machining process is changed and a part of the tools mounted on the lathe or the like is not used, the operation selection switch 14 of the unused tool is set to OF F, and the MPU 1 When the operation selection switch 14 is turned off, the display 8 is turned off, and even if the operation signal S _G is input at this time, the data in the register of the tool is held without being subtracted.

[0024] For example, in the processing program of the MPU 1, the thumbwheel switch 6'for setting the number of times of use is temporarily set to 9999, the light switch 7 is activated to write this data, and the machine tool is activated. When the thumbwheel switch 6'is set to 9998 and the light switch 7 is activated during a certain period of time or when the lot of processed products is finished, the indicator 8 for the tool number set by the thumbwheel switch 6 is activated. Alternatively, the number of processed pieces may be displayed. Also, if 997 is set for the thumbwheel switch 6'and the same operation as above is performed, the number of tool changes is displayed (the number of tools used to process the product lot is displayed). Good.

Furthermore, a number obtained by adding 50 to the tool number is set in the thumb wheel switch 6 for setting the tool number, and the tool unit price can be set in the thumb wheel switch 6'for setting the number of times of use so that both data can be set. The light switch 7 is operated to read it in the MPU 1, the tool number is set in the thumb wheel switch 6 for tool number setting, the thumb wheel switch 6 ′ is set to 9996, and the light switch 7 is activated again, the number of times of use On the display 8 of the tool number set by the thumb wheel switch 6 for setting, 9999 is set for the thumb wheel switch 6'for setting the number of times of use, and the tool cost after the light switch 7 is operated is displayed. If you set the thumb wheel switch 6'to 9995 and perform the same operation as above, the tool cost per product will be reduced. It may be displayed.

In this way, by making it possible to display the number of processed pieces, the number of times of tool exchanges, and the cost of those tools, it becomes possible to easily estimate the work fee, and at the same time, the machine tool It becomes possible to accurately grasp the operating status and operating efficiency.

By the way, in this embodiment, the MPU 1 is used for the circuit in the apparatus, but the MPU 1 may be replaced with a presettable counter 20 as shown in FIG.

In FIG. 1, reference numeral 2 is a data input switch, 7 is a light switch for loading the setting data of the data input switch 2 to the counter 20, and 3 is a display circuit including a display driver and a display element. Is an alarm LED lamp, 11 is an alarm buzzer, 14 is an operation selection switch, and 16 is an input signal S _G interface. For the data input switch 2, for example, a data selector connected to a tool number setting thumbwheel switch and a data buffer for storing data set in the data input switch provided for each counter are used. , One thumbwheel switch can be used to set data in sequence to all counters.

Since the usage of this circuit is similar to that using the MPU 1, the usage and action thereof will be omitted.

[0030]

【effect】

 Since the present invention is configured as described above, if the data of the number of serviceable lives of each cutting tool is set in the device, a notification means such as a buzzer or a lamp will automatically notify when the service life of the tool is reached. As a result, it is possible to properly manage the exchange of cutting tools even with artificial machines.

Therefore, the following effects are obtained.

Since the tool can be used for its lifetime, there is no waste, which leads to a reduction in cutting tool cost.

Since a tool that has reached the end of its life is not used, stable machining can be performed, so that it is possible to mass-produce products with high precision and finished surface roughness with little variation in machining dimensions, and quality can be improved.

It is possible to easily hold multiple machine tools such as NC lathes even with artificial machines.

[0035] It is not necessary to arrange a staff member who can judge the tool life for artificial manufacturing, which leads to labor saving.

Machine trouble due to breakage of the cutting tool is eliminated, and the operation rate of the machine is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment.

FIG. 2 is an external front view showing an embodiment.

FIG. 3 is a block diagram showing another embodiment.

[Explanation of symbols]

1 Microprocessor 2 Switch Means 4 Notification Means 6 Tool Number Setting Thumbwheel Switch 6'Tool Usage Count Setting Thumbwheel Switch 7 Light Switch 10 LED Lamp 11 Buzzer 16 Input Signal Interface Circuit _SG Operation Signal

Claims (1)

[Scope of utility model registration request] 1. Input means for inputting an operation signal indicating that one working process of a machine tool having a plurality of cutting tools is performed, and counting means for counting the operation signal input to the input means. Switch means for setting a value obtained by converting the cutting life of each of the plurality of cutting tools into the usable number of times in one working process of the machine tool, and the use of each tool set in the switch means To the number of times,
A cutting tool replacement timing informing device comprising a comparison means for outputting an alarm output when the number of operations counted by the counting means reaches and a notification means for notifying the replacement timing of each tool by the alarm output from the comparison means.