JPH06246599A - Machining schedule control method in fms - Google Patents

Abstract

PURPOSE:To execute the machining schedule of a machine tool in failure by the other machine tool so as to prevent the schedule retention of a system. CONSTITUTION:The kind of an alarm emitted from an NC machine tool D in failure is discriminated by a control computer 15, and in the case of discriminating the failure of an NC machine tool body part 1, a tool used by the NC machine tool D in failure is conveyed to the other NC machine tool, having finished a machining schedule, by an automatic tool conveyor device 5. At the same time, the machining schedule of the NC machine tool D in failure is transmitted to the other NC machine tool so as to execute the machining schedule of the NC machine tool D in failure by the other NC machine tool. Even with the generation of a faulty machine tool, the machining schedule can be thereby made up by the other machine tool during the operation of a system so as to prevent the schedule of the whole system from being delayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automated flexible production system (F) for efficiently producing a wide variety of products.
The present invention relates to a production method in MS, and particularly to a method for controlling a processing schedule in a highly automated FMS.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory diagram showing a conventional FMS production method. The whole system is managed by the management computer (15), and the work (10) is NC machine tool (D).
It is designed to be sequentially processed by ~ (A). Each NC
The machine tool body (1) has an automatic tool changer (AT
C) A magazine (3) and an arm (4) for exclusive use of tool exchange are provided so that the tool can be exchanged for the tool transported from the tool stocker by the automatic tool transport device (5). Then, a failure of the machine body part such as clogging of the filter in the oil hole cutting fluid tank, reduction of spindle head lubricating oil, etc. (hereinafter, the signal emitted from the NC machine tool due to this failure is called "alarm (R)"), axis ATC magazine failure such as motor overload or ATC hydraulic motor overload (hereinafter, the signal generated from NC machine tool due to this failure is referred to as "alarm (S)"). When a failure occurs in the arm for exchanging tools (hereinafter, the signal generated from NC machine tool due to this failure is called "alarm (T)"), these alarm signals are sent to the management computer (1),
The command issued from the management computer to the failed NC machine tool is stopped, and the work of the failed NC machine tool is interrupted (shown in the flowchart of FIG. 1).

[0003]

In the conventional FMS production method, when a certain NC machine tool fails and the schedule cannot be executed, it is necessary to wait for the repair of the failed NC machine tool to be completed. Also, after all other NC machine tool schedules have finished, the N
The tool of the C machine tool was attached to another NC machine tool, and the schedule of the failed NC machine tool was consumed. Therefore, if a certain NC machine tool fails, the schedule of the entire system is delayed. In this way, if the schedule of the entire system is delayed due to the failure of one NC machine tool, it will be fatal for the FMS, whose primary purpose is to efficiently produce a wide variety of products.

[0004]

According to the present invention, a machining schedule of a failed NC machine tool can be delegated to another NC machine tool even while the system is in operation, and a schedule delay of the system can be prevented. FMS that can
To provide a production method in. That is, the configuration means that when the management computer discriminates the type of alarm issued from the faulty NC machine tool and the fault is the fault of the NC machine tool main body, the faulty NC machine
The tool used by the machine tool is conveyed to another NC machine tool whose machining schedule has been completed by the automatic tool conveying device, and the machining schedule of the failed NC machine tool is transmitted to the other NC machine tool. It is to execute a machining schedule of an NC machine tool that has failed by another NC machine tool.

[0005]

By transferring the tool of the failed NC machine tool to another NC machine tool and transmitting the machining schedule of the failed NC machine tool to the other NC machine tool,
Since the machining schedule of the broken machine tool can be supplemented by another NC machine tool, the schedule of the entire system is not delayed.

[0006]

FIG. 3 is an explanatory view of an FMS using the present invention,
FIG. 2 is a flowchart showing the execution method. The present invention will be described below with reference to these drawings. (A)
~ (D) are NC machine tools with the same specifications (hereinafter, NC machine tool (A) is "(A) machine", NC machine tool (B) is "(B) machine",
NC machine tool (C) is referred to as "(C) machine", NC machine tool (D) is referred to as "(D) machine"), (1) is machine tool main body part, (2)
Is a computer for controlling the NC machine tool, (8) is a tool management control device for controlling the tool automatic transfer device (5), (3) is an automatic tool changing device (ATC magazine), (4) is a tool changing arm, (6) is the rail which is the track of the automatic tool transfer device, (7) is the tool stocker, (10) is the work, (11) is the trolley for transferring the work, (13) is the alarm discrimination means, and (14) is the management Each of the data transmitted from the computer is shown. The computer (2) of each NC machine tool is a management computer
It inputs the machining schedule and machining data sent from (15) and controls NC machine tools. Also, each N
The C machine tool is equipped with an automatic workpiece changer (APC) (not shown). The automatic tool carrier (5)
Rails (6) based on commands from the automatic tool transfer controller (8)
It moves along with to carry a predetermined tool from the tool stocker (7) to a predetermined NC machine tool and, conversely, a tool of the NC machine tool to the tool stocker. The tool is transferred and received by a tool exchanging arm (4) provided on the ATC of each NC machine tool. The work (10) is supplied by the stacker crane (12) and is conveyed to each processing location by the carriage (10). Management Computer (15)
Manages a machining schedule of each NC machine tool, a list of tools stored in each ATC magazine, a list of tools necessary for machining each work, and the like. Further, when a failure occurs in the NC machine tool, an alarm signal is transmitted from the failed NC machine tool to the management computer, and the alarm determination means determines the alarm type.

Next, the production method in the FMS of the present invention will be explained based on the flow chart of FIG. Now (D)
Suppose that something went wrong with the machine and an alarm was issued. The machining schedule for machine (D) is the schedule for machining workpiece (a) (a) and the schedule for machining workpiece (b) (b) and the schedule for machining workpiece (c).
(C) The alarm signal is input to the alarm discriminating means (13) of the management computer (15) as indicated by the arrow in the figure, and alarm (S) (ATC magazine failure), alarm (T) (tool change dedicated arm failure) And alarm
(R) (main unit failure) is determined. When it is determined that it is an alarm (R),
The management computer determines whether or not the machining schedule of the (A) machine has been completed, and if it determines that the machining schedule has been completed, the schedule (a) of the stored failure machine (D) schedules is stored.
Is assigned to the (A) machine, and the tool list in the ATC magazine of the (A) machine is compared with the tool list for the work (a) machining. And if it is determined that there are insufficient tools,
From the management computer to the defective machine (D),
(A) A command to convey to the machine is issued, the ATC magazine of the broken machine (D) rotates, and its arm (4) supports the insufficient tool at the delivery position. Here, a predetermined tool transfer command is transmitted from the management computer to the tool management control device (9), and in response to this command, a predetermined control signal is sent from the tool automatic transfer control device (8) to the tool automatic transfer device (5). Sent. In response to this command, the automatic tool carrier moves to the arm (4) of the failed machine (D), receives the insufficient tool, moves to the machine (A), and passes the insufficient tool to the arm of the machine (A). At this time, the management computer transmits a work (a) transfer command to the stacker crane (12), and the work (a) is transferred to the (A) machine by the carriage (11). Then, the schedule (a) is transferred from the management computer to the (A) machine, and the (A) machine is scheduled.
The work (a) is processed based on (a). In this way, the schedule (b) of the faulty machine (D) can be changed to (A) even while the system is operating.
Since it can be compensated by the machine, the schedule of the entire system is not delayed. If (A) machine does not have insufficient tools (if you have the tool of broken machine (D)),
The work (a) is conveyed as it is and processed by the machine (A).

In the execution process of the above program, (A)
If it is determined that the schedule of the aircraft itself has not ended, (B) it is determined whether or not the schedule of the aircraft has ended.
Of the schedules in (D), schedule (B) is assigned to machine (B), and the tool list in the ATC magazine of machine (B) is compared with the tool list for work (b) machining. And
If there is a shortage tool, the shortage tool is transferred from the faulty machine (D) and the work (b) is machined based on the schedule (b). In this way, the schedule (b) of the malfunctioning machine (D) can be supplemented by the machine (B) even when the system is operating, so the schedule of the entire system is not delayed. In addition,
When the schedule of (A) machine itself is finished during the machining of (B) machine, the schedule (a) by the (A) machine is executed in parallel.

If the schedule of the (B) machine itself has not ended, it is judged whether or not the schedule of the (C) machine itself has ended, and if it is judged that the schedule has ended, ( D) The work (c) is processed based on the machine schedule (C). In this way, the schedule (c) of the failed machine (D) can be supplemented by the machine (C), so that the schedule of the entire system is not delayed. In addition,
(C) If it is determined that the schedule of the machine itself has not ended, the process returns to (A) determination of whether the schedule of the machine itself has ended.

In this embodiment, when the alarm (S) or the alarm (T) is generated, the tool of the faulty machine (D) cannot be transferred to another machine tool, so that the operation of the faulty machine (D) is not performed. It stops and the machining schedule ends, but (A)
Machine- (C) possesses the tool of the faulty machine (D), the NC machine tool possessing the tool has the faulty machine.
It is also possible to assign the schedule of (D) and execute it with that tool. If the tool stocker owns the tool, the tool stocker transfers the tool from the tool stocker to one of the NC machine tools whose schedule has been completed, so that the schedule of the failed machine (D) is executed. You can also

By executing the above program, (A) machine ~ (C)
When the schedule for each machine is completed and all the schedules for the failed machine (D) are executed by machines (A) to (C),
Based on a command from the management computer, the automatic tool carrier returns the tools of each NC machine tool to the initial state (tool initial state), and the entire system stops. In addition, each NC
Whether or not the schedule of the machine tool is finished is always determined, and the schedules of the failed machines can be assigned and executed in order from the finished NC machine tool.

[0012]

According to the machining schedule control method in the FMS of the present invention, even if a machine failure occurs, the schedule can be compensated for by another machine tool while the system is in operation, so the schedule of the entire system is delayed. Never. Therefore, it is possible to achieve efficient production of a wide variety of products, which is the maximum purpose of FMS.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a processing schedule control method in an FMS of the present invention.

FIG. 2 is a flowchart showing a processing schedule control method in the FMS of the present invention.

FIG. 3 is an explanatory diagram showing a processing method in a conventional FMS.

FIG. 4 is a flowchart showing a processing method in a conventional FMS and a flowchart showing a processing schedule control method in the FMS of the present invention.

[Explanation of symbols]

1 ... Main body 2, Computer 3, ATC magazine 4, Arm 5, Automatic tool transfer device 6,
・ Rail, 7 ・ ・ Tool stocker, 8 ・ ・ Automatic tool transfer control device, 9 ・ ・ Tool management control device, 10 ・ ・ Workpiece,
11 ... Trucks, 12 ... Stacker cranes, 13 ...
Alarm discrimination means, 14, 16 ... Data, 15 ... Management computer.

Claims (1)

[Claims] 1. A plurality of NC machine tools equipped with an automatic tool changer in a main body, a management computer for managing a machining schedule of these NC machine tools, a tool automatic transfer device, and an NC machine tool have failed. A method for controlling a machining schedule in an FMS, comprising an alarm generating means for occasionally generating an alarm, wherein a management computer discriminates the type of an alarm generated from a malfunctioning NC machine tool, and the NC machine tool main body has a malfunction. When it is determined, the tool used by the malfunctioning NC machine tool is conveyed to another NC machine tool whose machining schedule has been completed by the automatic tool conveying device, and the machining schedule of the malfunctioning NC machine tool is changed to the other one. The processing schedule of the NC machine tool transmitted to the NC machine tool and failed by the other NC machine tool. Production method in FMS, characterized in that for the execution.