JPS61214955A - Process-change managing apparatus in line type nc machine tool - Google Patents

Abstract

PURPOSE:To change process so that working is not obstructed, when a specific machine is broken, by designating a substituted machine and supplementing the susbstituted machine for the broken machine without stopping the production line. CONSTITUTION:When a machining center 102b stops operation because of the generation of trouble, a machining center 102c in a process is used as a substituted machine. Then, the works W5-W7 are worked as they are, without being replaced, by the machining center 102c, and the work W4 is detect as defective work and transported into a worked-article stocker without being worked. In the management, uing the machining center 102c as susbstitued machine for the works succeeding to the work W3, the working data for the working in the machining center 102b which is broken is added into the machining center 102c, and working is carried-out. Therefore, the flow of the whole production line is not brought into stop, and the substitution to a new machine is carried-out immediately, and production is continued, and the reduction of productivity can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial Application Field The present invention relates to a process change processing device for a line-type NC machine tool.

(2) Prior Art Conventionally, a typical example of a workpiece transfer line in a dedicated machine tool group is a transfer machine (hereinafter referred to as TRM) used for mass production of a single workpiece. Furthermore, a flexible manufacturing system (hereinafter referred to as FMS) is known in which a plurality of NC machine tools are connected by a transfer device to perform small-volume production of various types of workpieces.

Recently, flexible transfer lines (hereinafter referred to as FTL), which use multiple NC machine tools, are mass-production oriented, and have the flexibility to plane different types of workpieces, have become an intermediate line between the above TRM and FMS. It is attracting attention as a mass production line.

(3) Problems to be solved by the invention The above-mentioned FTL generally has a short takt time, so it has the advantage of high machining efficiency. However, there was a problem that all NC machine tools would stop if the system went down due to a malfunction.

Solving this problem means that the N
It is desired that C machine tools (hereinafter referred to as down machines) be dealt with flexibly and quickly.

(4) Purpose The purpose of the present invention is to solve the problem in view of the above-mentioned circumstances. To provide a process change processing device.

(5) Means and action for solving the problem In order to achieve the above object, the present invention has a plurality of machining stations on a conveyance line, and an NC machining machine arranged corresponding to each machining station. In line production equipment equipped with machinery,
This is a process change processing device that designates another machine as a replacement machine when a specific NC machine tool goes down, so that the production processing line that took early countermeasures does not have to be stopped.

In other words, in line-type production equipment, there is a program in which the workpiece machining location is determined for each machine, and an alternative program in which when a specific NC machine tool goes down, the machining location that was in charge of that down machine is shared. In order to specify the machine, an alternative machining program memory is provided that allows a machine other than the down machine to hold the machine program of the down machine in a replaceable manner;
an input means for inputting the correction information of the down machine;
a comparative judgment means for comparing and determining whether the processed estage fish of the alternative machine is a pre-process or a post-process of the processed estage fish of the down machine; a calculation means for calculating the first processed estage fish of the alternative process; It consists of a comparison/determination means for comparing and determining the workpiece machining station and the normal workpiece machining station, and a machining program memory created based on the downtime migration data file. Therefore, the present invention is a line-type production facility, and when a specific machine goes down, it is possible to designate a substitute machine and use the substitute machine to replenish the down machine without stopping the line, making it possible to change the process so as not to hinder processing. This will be dealt with accordingly.

Therefore, productivity does not decrease compared to the conventional method, and on the contrary, the operating rate improves.

(6th Example) Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 4 is a schematic diagram of an FTL suitable for implementing the present invention.

In FIG. 4, the system is roughly configured with a management department and a work department, and the management department is equipped with a central control unit 100, and controls the flow of each machining process while the system is online, NC data as machining information, tool data, preparation, etc. Information such as processing schedule data and setup schedule data is comprehensively grasped and managed.

In the work department, the main controller 101 sequentially transmits machining data sent from the central controller 100 to each machining center 102a, 102b, and 102c.

NC device 103a of 102d and 102e.

Commands are given to 103b, 103c, 103d and 103e. Along with the central control device 100, the main control device 101 and the NC devices 103a and 103b.

103c, 103d and 103e are linked to the optical data highway 104 and
The necessary data is imported as and when required via the linkage unit.

The main controller 101 also transfers the work W to the transfer line 105.
A conveyance control device 106 that allows the materials to be conveyed, and a material stocker 107 that stores and manages the materials. Alternatively, it is also connected to and controlled by a workpiece stocker 108 that stocks processed workpieces. Furthermore, the main controller 101 controls each machining center 102a.

102b, 102c, 102d and 102e PC device (referred to as programmable controller) 109a
, 109b, 209c, 109d and 109e.

In the FTL, different types of workpieces W are transported in units of lofts from the material stocker 107: to the transport input 105, and are sequentially transported from stations ST, 1 to ST, 11, to each machining center 102a, 102b, 10.
2c, 102d, and 102e perform predetermined processing, and after the processing is completed, they are stored in the processed product stocker 108.

In this FTL, especially each machining center 102a =
There is no problem as long as there is no failure in 102c, but if machining center 102C among the machining centers 102a to 10e has to make an emergency stop due to a tool breakage or the like during machining, the entire FTL will stop and cannot operate. This is a big problem.

The present invention allows, for example, when the machining center 102C breaks down and goes down in FTL, it continues to operate even during repair work.
This is an attempt to deal with this by having other machining centers share the processing of the machining center 102C.

The principle of the present invention will be explained using FIG. 2. Second
Figures (A) and (B) are explanatory diagrams showing a part of the conveyance line in Figure 4. In other words, FIG. 2(a) shows an alternative machine (a machine that will share the processing in the event of a failure), for example, when the machining center 102C is in the downstream process of a down machine (a machine in which a failure has occurred), for example, the machining center 102b. ) is a model explanatory diagram when an alternative machine, for example, a machining center 102a, is in the preceding process of a down machine, for example, a machining center 102b. In FIG. 2(a), when the machining center 102b is down, each station ST, 1 to station ST, 7 on the transfer line 105 has workpieces W, -W, respectively. The alternative machine is the machining center 102C, which is a downstream process of the machining center 102b, which is a down machine, and when processing is to be performed, the workpieces WS, W, , W, after station S7.5 are processed by the machining center 102C.
Since b was normally machined before it went down, it is sufficient to process it using the machining data from the machining center 102c before it goes down. Work W4 is on machining center 102b
During machining, the machining center 102b went down due to a failure or the like, resulting in a defective workpiece. Also station ST,
The workpieces before 3, that is, the workpieces W1 to W, are before being processed by the machining center 102b, which has become a down machine.
Workpieces W1 to W3 will be processed by an alternative machine. In other words, the work W3 is the first alternative work, and the work W3 is the first alternative work.
2 is the second alternative work, and work W is the third alternative work.
It will be the th.

Note that detection of a failure by the machining center 102b, which is a down machine, involves an emergency stop of the down machine itself, or a defective work is detected by measuring the work with a measuring device or the like.

Therefore, the workpieces Ws, Wh, and W are machined as they are at the machining center 102C using normal machining data without being replaced, and the workpiece W4 is detected as a defective workpiece.
The workpiece is transported to the workpiece stocker 108 without being processed, and the workpiece W3 is transferred to the machining center 102C as an alternative machine.
The machining data processed by the machining center 102b, which is a down machine, is added to the machining center 102C, and corresponding processing is performed so that the machining can be performed. In addition, in this example, the explanation is N? In order to perform MK, one substitute machine was selected, but multiple substitute machines may be set taking into account the machining schedule, tool data, etc.

In FIG. 2(b), when the machining center 102b is down, each station ST, 1 to ST, 7 on the conveyance line 105 has workpieces W, to W7, respectively, as in FIG. 2(a). When a substitute machine is to be processed using the machining center 102a, which is a pre-process of the machining center 102b, which is a down machine, the workpieces W, W, from stations ST, 5 and onwards.

W? The machining center 102 is already a down machine.
Since b has been normally machined before being down, it can be machined as it is at the machining center 102c using normal machining data.

The workpiece W4 is a defective workpiece because the machining center 102b went down due to a failure or the like during machining at the machining center 102b. Also, station ST, 2.
Since the workpieces W2 and W3 on ST and 3 cannot flow backward on the line, they are moved to the machining center 102a, which is an alternative machine.
Therefore, it is necessary to treat it as an unprocessed product and not treat it as a defective work. Machining center 1
The first alternative work to be processed using 02a as an alternative machine is work W.

Incidentally, detection of a failure or the like by the machining center 102b, which is a down machine, is performed in the same manner as described in FIG. 2(A).

Therefore, workpieces W, W6, and W are processed as they are at the machining center 102c as normal without being replaced, workpiece W4 is detected as a defective workpiece, and workpieces w2 and W3 are detected as unprocessed and transported without being processed. , the machining center 102a may be used as a substitute machine for the workpiece Wl, and the machining data that was being machined by the machining center 102b, which is a down machine, may be added to the machining center 102a to perform processing.

The configuration of the present invention will be explained in detail based on the principle of FIG. 2 and with reference to the control block diagram shown in FIG. 1.

In FIG. 1, a central control unit (CPU) 100 is connected from a keyboard with a screen l to an input/output circuit 1a to a down machine, for example, a machining center 102b in the explanation of FIG.
For example, in the explanation of FIG. 2, the machining center 102a or 120C is input as an alternative machine. Further, the measurement sensors 2 of the stations ST, 1 to ST, 7 are connected via an interface 2a.

In advance, the CPU 100 stores machine program data in the machine program data memory 3 for each machining process, that is, for each machine and workpiece, for normal machining and alternative machining corresponding to each failure situation. Further, the cutting program for each machine and each workpiece is stored in the cutting program memory 4, and the tool data is stored in the tool data file 5. Now, when any of the machining centers 102a to 102e breaks down and goes down, the sensor 2 can detect the station fish that is the downed machine, or
Manually enter information into the CPU 100 using the screen keyboard 1,
Temporarily store it in the down machine ST and memory D. Since which machining center is most suitable as a substitute machine has been set in advance from the machine program data memory 3, the substitute station location is temporarily stored in the substitute machine ST/memory C.

The value is sent from the down machine ST memory D to the machining defect ST memory DN, and the value DN and 111D of the down machine are filed in the down time migration data file 6. As explained in FIG. 2, in the down time migration data file 6, the machining center 102b, that is, 5T-11h4 is 5T-1ill when it is down, and the 5T in the DN column and D column is
Set flag "1" to -1114 and file.

In the case of FIG. 2 (b) from the substitute machine ST/memory C, the value is filed in the C column of the down migration data file 6 by setting a flag "1" in ST4 2. In other words, it indicates that the substitute machine is in the previous process of the down machine.

The respective values from the down machine ST/memory D and the substitute machine ST/memory C are loaded into the comparator 7.8. If the substitute machine is in the previous process, that is, D>C, the comparator 7 compares and discriminates and opens the AND gate 9 with a bit signal, and the substitute machine s'r-mc passes through the AND gate 9. The calculation unit 11 performs calculation of C-1. In addition, if the substitute device is a post-process, that is, a DEC, the comparator 8 makes a comparison, and the bit signal opens the AND gate 10.
The down machines ST and 11hD pass through the gate 10, and the calculation unit 12 calculates D-1. The values of C-1 and D-1 processed by the calculation unit 11.12 are taken into the OR gate 13, and one of the values is passed through to perform the alternative processing 1.
Store it in the th ST memory ■. In the case of FIG. 2(b), C-1=1.

Therefore, ST in column ■ of migration data file 6 during downtime
, set flag 1'' in rlhl and file.

Next, the ST counter 14 sequentially displays 5T11h of Ni (1
to N) to the comparator 15, and the down machine ST
- Load the values of D and I from memory D and alternative processing 1st ST to memory I into the comparator 15, respectively.

The comparator 15 compares and determines I<Ni<]), and i<Ni<]).
When the condition of Ni<D is satisfied, the AND gate 16 is opened, and Ni of the counter pigeon is allowed to pass through and stored in the unprocessed workpiece ST and memory A.

Furthermore, flag 1" is set in column A of down migration data file 6 from raw work ST/memory A. In the case of FIG. 2 (b), ST, 11h2 and 3
Flag 1" is raised.

Further, the ST counter 14 sequentially sends Ni of STl'lh to the comparator 17, and causes the comparator 17 to take in the value from the down machine ST/memory D.

The comparator 17 compares and determines D<Ni, and when the condition of D<Ni is satisfied, the AND gate 18 is opened and the ST
It passes through the counter Ni and is stored in the normal machining workpiece ST/memory G. Furthermore, flag 1'' is set in the G column of the down transfer data file 6 from the normal machining workpiece ST memory G and the file is filed. In the case of Fig. 2 (b),
Flag 1″ is set for ST cases 5.6 and 7.

All of the values of DN, D, C, I, A, and G processed in this way are collectively filed in the down migration data file 6.

Then, based on the machine program memory 4 and down transition data file 6, it is rewritten as real-time machining data at the time of actual transition to alternative machining and is filed in a real-time machining data file 19. Furthermore, those data in the down transition data file 6 are sequentially taken in by carrier signals to open the AND gate 20, processed by the data shift processing section 21, and filed in the alternative transition shift data file 22. That is, from the generation of the down machine until all STs shift to alternative machining, each workpiece is processed based on the down movement data file 6, and the down movement data is also shifted to the next process by the conveyance signal to the next process. Ru. In addition, the downtime movement data of the real-time processing data file can also be rewritten accordingly.

When the process is transferred from ST and N11 to N112 (workpiece conveyance processing) in FIG. 2 (b), the file becomes as shown in FIG. 1.

The operation of the present invention will be explained based on the flowchart of FIG.

In Fig. 3, first, the ST floor of the down machine is measured on the 0th stage using the sensor of the measuring device or the screen keyboard 1.
Enter o.

In the second stage, alternative information such as the machine program data file 3 and tool data file 5 is read. next,
At the 0th stage, it is determined whether or not the machine can be replaced as an alternative machine among the currently used machining centers other than the down machine.

If there is no substitute, a message indicating that substitution is not possible is issued at the 0th stage, and when the machine goes down at the 0th stage, it is determined whether there are any other unprocessed workpieces of a different type in the material stocker 107, and if there is a different workpiece, Then, it is fed back again before the 0th stage and judged. If there are no different types of work, production will be stopped.

If there is a machine that can be substituted at the 0th stage, the defective workpiece is processed at the 0th stage. In other words, 5 of the defective workpieces are transferred from the down machine ST/memory D to the defective processing ST/memory DN.
T-NaDN is stored, and DN4 of the down migration data file 6! File in III.

At the 0th stage, it is determined whether the substitute machine is a front process or a post process of the down machine. If the alternative machine is a post-process of the down machine, the comparator 8 compares the DEC, and when the conditions are satisfied, the bit signal goes up.

If the alternative machine is the previous process of the down machine, comparator 7 indicates D.
When the EC is compared and the condition is satisfied, a bit signal is set.

If it is the previous process in stage (■), the calculation section 11 performs the calculation of C-1, and the first ST/memory of alternative processing is performed! The value I is stored in column 1 of the downtime migration data file 6. If the alternative machine is a downstream process of the down machine, compare D<C with the comparator 8, and if the conditions are satisfied, store the value ■ in the first ST/memory I of the alternative process and move when down. File in column 1 of data file 6. Furthermore, the unprocessed workpiece ST in the ■stage and the [phase] stage
1lhA and normally machined workpiece 5T-NaG are each compared with comparator 15.17, and the values are compared with each unprocessed workpiece ST.
・Memory A, normal machining workpiece ST ・Memorize in memory G, and transfer data files 6 A and G when down.
File in 11llll.

Next, in stage 0, it is determined whether tool setup is required for the substitute machine, and if tool setup is necessary, it is instructed to set up the tool in stage 0, and tool setup is completed in stage 0. let When the tool setup is completed or it is determined that the tool setup is not necessary at the 0th stage, the respective data DN, D, C, !, filed in the down transition data file 6 are transferred. A and G are transferred to the real-time processing data file 19 and rewritten each time a carrier signal is generated.

When the first substitute work enters the substitute machine in the [phase] stage, substitute transfer processing is performed to newly exchange the program to the substitute machine. Subsequently, processing is performed by an alternative machine in the 0th stage. In this way, when a machining center goes down due to a failure or the like in FTL, if the processing is carried out based on the above-described flowchart, even if the machine goes down, it can be handled smoothly and machining can be performed without stopping production.

(7) Effects By equipping a line-type NC machine tool with the process change processing device of the present invention, when a down machine occurs due to a failure such as a broken tool in conventional FTL production, the entire flow stops and production is interrupted. There is no need to interrupt processing and reduce productivity, and you can immediately replace the machine with an alternative machine and continue production. In addition, the number of defective products can be kept to a minimum and they can be dealt with smoothly, so there is no downtime and there is no drop in production, and the production volume can be increased to the same level as before, which in turn leads to improved operating rates.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating the present invention in detail. Figure 2 is an explanatory diagram of a part of the conveyance line in Figure 4, and (a) shows when the alternative machine is in the downstream of the down machine.
(B) is an explanatory diagram when the substitute machine is in the preceding process of the down machine. FIG. 3 is a flowchart diagram illustrating the present invention in detail. FIG. 4 is a schematic diagram of an FTL line suitable for implementing the present invention. 1...Keyboard with screen 2...Measuring device 3...
・Machine program data 4...Canada program memory 6...Downtime migration data file 7, 8.15.
17...Comparator DN...Machining defect ST/Memory D...Down machine ST/Memory C...Alternative ST/Memory ■...Alternative processing 1st ST/Memory A...Unprocessed work ST/Memory G...Normal machining ST/Memory

Claims (1)

[Claims] In line-type production equipment that has multiple machining stations on a conveyance line and is equipped with NC machine tools placed corresponding to each machining station, the machining program memory and machining location where the workpiece is machined for each machine type are used. , when a specific NC machine tool goes down, a replacement machining program memory that designates and replaces a replacement machine to take over the machining part that the down machine was in charge of, and detects and inputs the down machine. an input means, a comparison judgment means for comparing and judging the processes of an alternative machine and a down machine, a process change processing means for processing alternative processing, unprocessed and normal processing at the time of alternative processing, and transfer data by the process change processing means. 1. A process change processing device for a line-type NC machine tool, characterized in that the process change processing device is comprised of a migration data file that sequentially migrates data files.