JP3060515B2 - Production control device - Google Patents

Description

Description: Object of the Invention [Industrial application field] The present invention relates to a production amount management device, and more particularly, to an individual production amount of a plurality of types of workpieces machined by a machine tool by executing a machining program. The present invention relates to a production amount management device for managing the production amount.

2. Description of the Related Art Conventionally, in an NC machine tool, machining of a work is performed by controlling a drive of a machine tool by executing a machining program. In addition, a counter device is used as a device for managing the production amount of processed parts. This counter device increments the counter value by a predetermined number each time one machining program is completed, and when the counter value reaches a preset target production quantity, the operator notifies the operator of the completion of all machining. To inform. That is, the number of processed parts processed by one execution of the processing program is incremented by one, and the display lamp or the like is turned on when the cumulative number, that is, the total number of processed parts reaches the target production quantity. To notify the operator of the end of all machining. Information such as a preset target production quantity, a single increment quantity, and a sequentially changing counter value is stored in the NC
It is stored in the memory of the device and displayed on the screen of the CRT.

However, in the above setting, every time the type of the processed part changes, the operator must input the target production quantity and the like from the keyboard while referring to the work plan. Not suitable for production control. Accordingly, Japanese Patent Application Laid-Open No.
There is a device for managing the number of machined parts proposed in -295154. In this apparatus, a machining program number (corresponding to a type of a machined part) and a target production quantity corresponding to the machining program number are set in advance, and then the machining program is executed to perform machining processing. For example, if the production plan is to produce 30 processed parts A, then 20 processed parts B, and then to produce 10 processed parts C, then, after setting each target production amount together with the processing order, The machining process is performed by repeatedly executing the machining program. In this example, when the value of the counter reaches 30 due to the repetitive execution of the machining program for the machining component A, the execution of the machining program is terminated, the counter is reset, and the execution of the next machining program (for the machining component B) is performed. When the counter value reaches 20, the counter is similarly reset and the next machining program (for machining component C) is executed. Thus, the machined part C
The operator is notified that the production of all the processed parts has been completed when 10 pieces have been produced.

[Problems to be Solved by the Invention] However, in the recent high-mix low-volume production mode, not only the number of types of processed parts is increased, but also in order to flexibly cope with orders from customers, production plans are repeatedly made. Must be changed. That is, the processing order must be changed many times. Therefore, in the apparatus disclosed in Japanese Patent Application Laid-Open No. 63-295154, the setting must be changed each time, causing a problem that the operating efficiency of the operator is reduced. For example, the initial setting for one week is (workpiece A ×
10) → (B × 10) → (C × 20) → (B × 10) → (C ×
30) →… →→ (A × 20) → End, and if the plan is changed so that the machined part C is preferentially produced early, it must be set again to change the machining order. This is very time-consuming for the operator. That is, in the above-described apparatus, in order to manage the production amounts of a plurality of types of processed parts, it is necessary to execute the processing in a preset processing order, and it is easy to deal with a change in the processing order. Can not do it. For this reason, the setting is forced to be changed many times, and the operating efficiency of the operator is reduced.

Also, in such a high-mix low-volume production mode, it is desired to automatically switch a machining program according to the type of a detected machined part using an automatic work sorting apparatus or the like, and to manufacture the machined parts in a random order. However, the above-mentioned apparatus cannot cope at all.

A production management device according to the present invention solves the above-described problems, manages the production amount individually regardless of the processing order of a plurality of workpieces, and reduces various setting operations to improve the operation efficiency of an operator. With the goal.

Configuration of the Invention [Means for Solving the Problems] As illustrated in FIG. 1, a production amount management device of the present invention includes a plurality of types of workpieces processed by one machine tool by executing a processing program. A production amount management device that individually manages the production amount; a plurality of counters; and a counter identification unit that identifies one of the plurality of counters according to the type of the machining program or the content of the program. Each time the machining program is executed, a counter operating means for adding or subtracting a value of the counter specified by the counter specifying means by a number determined according to the executed machining program is provided. I do.

[Operation] The production volume management device of the present invention having the above-described configuration includes a plurality of counters, and the counter specifying means allows addition or subtraction operation from among the plurality of counters according to the type or program content of the machining program. One counter to be specified is specified. Each time the machining program is executed, the counter operating means adds or subtracts the value of the counter specified by the counter specifying means by a number determined according to the executed machining program. Therefore, since the machining program differs for each type of workpiece, only the counter corresponding to the type of workpiece is added or subtracted. The value of this counter corresponds to the production of the workpiece. That is, the counter that operates according to the machining program is switched.

As a result, regardless of the execution order of the machining program, only the counter specified from the machining program operates,
The cumulative number corresponding to the production amount of each individual workpiece is stored.

[Embodiment] In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of a production amount management device of the present invention will be described below.

FIG. 2 is a block diagram illustrating a schematic configuration of an NC device that performs a production amount management process as one embodiment. The NC unit is a central control unit (hereinafter referred to as master CPU) 1, ROM2, RA
M3, keyboard 4, CRT5, external communication unit 6, motor control unit 7, ATC
It comprises a control unit 8, an external signal control unit 9, and a bus 10 for interconnecting these.

The ROM 2 stores a control program for controlling the operation of the NC device itself and various data. The RAM 3 stores a machining program for driving and controlling an NC machine tool (not shown), various data, and a production counter described later. The keyboard 4 is used for setting various data necessary for processing, setting of a processing program, and setting a counter value and the like to be described later. The CRT 5 is a display for displaying a machining program stored in the RAM 3, various data, and the status of a counter described later. The external communication unit 6 is an interface for communication by RS232C or the like, and inputs a machining program from the outside and stores it in the RAM 3. Motor control unit 7, AT
The C control unit 8 is a control circuit which is connected to a motor of an NC machine tool and an automatic tool changer (not shown), and drives and controls them in accordance with a machining program. A display lamp 11 is connected to the external signal control unit 9 and turns on the display lamp 11 in response to a count end signal described later.

Next, a counter (hereinafter, referred to as “counter”) that controls the production
This will be described with reference to FIG.

The production counter is provided in a predetermined storage area in the RAM 3, and in this embodiment, is constituted by four sets of a first production counter 21, a second production counter 22, a third production counter 23, and a fourth production counter 24. The production counters 21, 22, 23, 24 are respectively called current counters C (1), C (2), C (3), C (4) (these are collectively referred to as current counter C (n)). End counters E (1), E (2), E (3), E (4) (these are collectively referred to as an end counter E (n));
(1), A (2), A (3), A (4) (these are collectively referred to as a valid flag A (n)) and a unit count N
(1), N (2), N (3), N (4) (these are collectively called unit count number N (n)).

The current counter C (n) stores a counter value that indicates a production amount of a machined part that changes sequentially each time the machining program is executed. The end counter E (n) stores a preset target production quantity (the total number of processed parts) of the processed parts. For example, when the production plan of the processed parts is 500, the end counter E (n) is stored. The value of n) is 500. The validity flag A (n) is a flag for determining whether or not the addition operation of the current counter C (n) described later is permitted. The unit count number N (n) represents the number of processed parts produced by executing one processing program. Therefore, the value that has resulted in the number of executions of the machining program in the unit count N (n) corresponds to the count value of the current counter C (n). still,
Normally, the initial value 0 is set in the current counter C (n), but an arbitrary value may be set as the initial value. In this case, a value obtained by adding the initial value is used.

The current counter C of the production counter thus configured
(N), end counter E (n), unit count number N
Each value of (n) is arbitrarily set by an input from the keyboard 4 and is displayed on the screen 51 of the CRT 5 as shown in FIG. In the example of this figure, the setting mode of the unit count number N (n) in which the cursor K blinks (indicated by an asterisk in the drawing) is shown.

Next, a machining program used in the NC device will be described. In the machining program, in addition to the normal instruction code, a counter instruction code for determining which of the four production counters 21, 22, 23, 24 is allowed to operate is written. I have. The instruction code is M code.
(Auxiliary function code) are used and are set as shown in Tables 1 and 2. That is, when the first two digits of the M code are 21 and 22
In this case, whether or not the operation of the production counter is permitted (valid or invalid) is determined, and the number of the production counter is designated by the last digit of the M code.

This M code is written in the machining program PR as shown in FIG. In the example of FIG. 7A, only the first production counter 21 is made valid and the other production counters 2 are activated.
2,23,24 are invalidated. In the example of FIG.
Only the second production counter 22 is valid and other production counters
21,23,24 are invalidated.

Next, a production amount management process executed by the NC device will be described. FIG. 6 is a flowchart showing a production volume control routine, which is started by a predetermined operation from the keyboard 4.

First, one block (one instruction unit) of the machining program is read (S100). Subsequently, it is determined whether the read one block is an instruction code of M211 to M214 (S10).
Five). If "YES" is determined, the effective flag A (n) of the production counter determined by the last digit of the instruction code is set to the value 1
Is set (S110). For example, in the case of M214, the value 1 is set to the valid flag A (4). Next, as shown in FIG.
Screen 51 showing the status of the production counter displayed on CRT5
Of the specified production counter is highlighted (S115). In this figure, the heading of the fourth production counter is highlighted (hatched in the drawing).

If the determination in step 110 is “NO”, these processes are skipped and one block read in step 100 is
It is determined whether the instruction code is 221 to M224 (S120). "Y
If "ES" is determined, the validity flag A (n) of the production counter determined by the last digit of the instruction code is reset to a value of 0 (S125). For example, if it is M221, the valid flag A
The value of (1) is reset to 0. Next, the heading of the designated production counter on the screen 51 showing the state of the production counter displayed on the CRT 5 is normally displayed (S130).

If the determination in step 120 is "NO", these processes are skipped and the instruction code read in step 100 is executed (S135). For example, motor control or ATC
Control is executed. Subsequently, it is determined whether or not the read one block is an end command of the machining program (S14).
0). In the present embodiment, the determination is made based on whether the instruction code is M30 or M02. If “YES”, that is, if it is the end command of the machining program, first, the value 1 is substituted for the variable n (S145). Then, it is determined whether or not the valid flag A (n) has a value of 1 (S150). In this case, the first production counter 21
Of the valid flag A (1) = 1. If A (n) is not 1, the variable n is incremented by the value (S155), and if n ≦ 4, the process returns to the step (S160). That is, it is determined whether the value of each of the valid flags A (1) to A (4) is 1 sequentially.

If it is determined in step 150 that the valid flag A (n) = 1, the unit count N (n) is added to the counter value of the current counter C (n) (S165). At this time, CRT5
Is also changed to the added value. Next, it is determined whether or not the value of the current counter C (n) after the addition is equal to or greater than the value of the end counter E (n) (S170). Current counter C (n)
Is greater than or equal to the value of the end counter E (n), the production quantity of the machined component has reached the target production quantity, the count end signal is turned on (S175), and the current counter C (n) is turned on.
Is smaller than the value of the end counter E (n), the process of step 175 is skipped, and the process proceeds to step 155.

When the determination of validity / invalidity of the four production counters 21, 22, 23, and 24 and the addition of a predetermined number of valid current counters C (n) are completed, the determination in step 160 is "N
O ”, and the process proceeds to step 180.

In step 180, it is determined whether or not the count end signal is off. This determination is “NO” only when the process of step 175 is executed, that is, when the count value of any of the production counters reaches the target production quantity, in which case the display lamp 11 is turned on (S185). ), End this routine. On the other hand, if the determination in step 180 is “YES”, that is, if the production quantity of any processed component has not reached the target production quantity, the process returns to step 100, and the above processing is repeated.

As described above, the NC that performs the production volume management process
According to the apparatus, every time the machining program is executed once, the current counter C determined according to the machining program is set.
The count value of (n) is incremented by the unit count number N (n). That is, the production counter that increments for each type of processed part is switched. Therefore, no matter what processing order is used to produce processed parts, the production quantity can be counted individually for each type of processed part. Therefore, unlike the conventionally proposed apparatus, there is no problem that various settings are redone each time the processing order is changed, so that the operating efficiency of the operator is significantly improved. In addition, the heading of the active production counter is highlighted on the screen of the CRT 5 and the end of production of other processed parts is also displayed, so that the production status can be grasped at a glance. Furthermore, if you want to count the production quantity for each type of processed part and simultaneously count the total production quantity of all types of workpieces,
An M code for designating a production counter for counting the total production quantity may be added to all machining programs, and can be used in various ways according to the management mode. Of course, the end of the component processing can be recognized by turning on the display lamp 11.

In the embodiment described above, the production counter is switched using the M code. However, the production counter may be switched based on the program number indicating the type of machining program. Hereinafter, an embodiment in this case will be described as a second embodiment.
The description of the same parts as those in the above-described embodiment will be omitted.

As shown in FIG. 7, the production counter includes a first production counter 31, a second production counter 32, a third production counter 33, and a fourth production counter.
It consists of production counters 34, each of which is a current counter C
(N), end counter E (n), used program No.P
(N) and the unit count number N (n). still,
n corresponds to the number of each production counter, and n = 1 to 4.

Program No.P (n) used is the current counter C (n)
To determine whether or not to allow the addition operation, that is, to specify a valid production counter from the number of the machining program to be executed. The current counter C (n), the end counter E (n), Like the unit count number N (n), it is arbitrarily set by the input from the keyboard 4 and displayed on the screen 51 of the CRT 5 as shown in FIG. In the example of this figure, the cursor K blinks (indicated by a star in the drawing).
This shows the setting mode of the program No. P (1) used by the first production counter 31.

Next, a machining program used in the NC device will be described. As shown in FIGS. 9A to 9D, in the machining program PR, a program number representing the type of the machining program is written after the alphabet "O" before the normal instruction code. . Then, based on the program number, a production counter that is made effective by a production amount management process described later is specified.

Next, a production amount management process as a second embodiment executed by the NC device will be described. FIG. 10 is a flowchart showing a production control routine, which is started by a predetermined operation from the keyboard 4.

First, one block of the machining program is read (S20
0), it is determined whether or not the end command is a machining program (S205). If it is not the end instruction (M30 or M02 instruction code), the instruction code is executed as it is (S210). If it is an end command, the program number of the machining program being executed is the program number No.P (1) -P of each production counter.
It is repeatedly determined one by one whether or not it matches (4) (S215 to S230). Program number and program No.P
If (n) matches, the unit value N is added to the counter value of the current counter C (n) of the production counter.
(N) is added (S235). At this time, the count value of the current counter C (n) displayed on the CRT 5 is also changed to the added value. Next, the current counter C after the addition
It is determined whether the value of (n) is equal to or greater than the value of the end counter E (n) (S240). If the value of the current counter C (n) is equal to or greater than the value of the end counter E (n), that is, Only when the production quantity of the processed part reaches the target production quantity, the count end signal is turned on (S245), and the process proceeds to step 225.

When the determination of validity / invalidity of the four sets of production counters 31, 32, 33 and 34 and the addition of a predetermined number of current counters C (n) to be valid are completed, the determination in step 230 is "N
O ", and it is determined whether or not the count end signal is off (S250). If the determination in step 250 is "YES", the production quantity of any processed part has not reached the target production quantity yet, so the processing shifts to step 200 and the above processing is repeated. On the other hand, if the count end signal is ON, the display lamp 11 is turned on (S255), and the routine ends.

Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments at all. For example,
The number of sets of the production counter may be increased so as to correspond to multi-kind production. Of course, the present invention can be implemented in various modes without departing from the gist of the present invention.

Effects of the Invention As described in detail above, according to the production amount management device of the present invention, since the operating counter is switched according to the machining program, it is specified from the machining program regardless of the execution order of the machining program. Only the operated counter is operated, and the accumulated number corresponding to the production amount of each work is stored. As a result, it is possible to individually manage the production amounts of the workpieces irrespective of the processing order of a plurality of types of workpieces. Along with this, various setting operations are reduced, and the operating efficiency of the operator can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a basic configuration of the present invention, and FIGS. 2 to 6 show a first embodiment, and FIG.
Schematic configuration diagram of NC device, Fig. 3 is configuration diagram of production counter,
FIG. 4 is an explanatory diagram showing a screen displayed on a CRT, FIG. 5 is an explanatory diagram showing a machining program in which M codes are written,
FIG. 6 is a flowchart showing a production amount control routine, FIGS. 7 to 10 show a second embodiment, FIG. 7 is a block diagram of a production counter, and FIG. 8 is a CRT. FIG. 9 is an explanatory diagram showing a machining program in which a program number is written, and FIG. 10 is a production amount management rule.
This is a flowchart showing a chin. 1 Master CPU 2, ROM 3 RAM 21, 31 First production counter 22, 32 Second production counter 23, 33 Third production counter 24, 34 Fourth production counter

Claims (3)

(57) [Claims] 1. A production amount management device for individually managing the production amounts of a plurality of types of workpieces processed by one machine tool by executing a machining program, comprising: a plurality of counters; A counter specifying means for specifying one of the plurality of counters, the addition or subtraction operation of which is permitted according to the contents of the program; and a counter specification means for specifying the counter every time the machining program is executed. A counter operating means for adding or subtracting the value of the counter by a number determined according to the executed machining program. 2. The production amount management device according to claim 1, further comprising display means for simultaneously displaying a display in which a head of the counter is associated with a value for the plurality of counters. 3. The production amount management device according to claim 2, wherein the display means displays the heading of the counter specified by the counter specifying means so as to be distinguishable from other counters.