CN102789213A - Production management device and method for component installing production line - Google Patents

Production management device and method for component installing production line Download PDF

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Publication number
CN102789213A
CN102789213A CN2012101476232A CN201210147623A CN102789213A CN 102789213 A CN102789213 A CN 102789213A CN 2012101476232 A CN2012101476232 A CN 2012101476232A CN 201210147623 A CN201210147623 A CN 201210147623A CN 102789213 A CN102789213 A CN 102789213A
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production
cycle length
production line
online
task
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CN102789213B (en
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村土浩章
矢野高光
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Fuji Corp
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Fuji Machine Manufacturing Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention provides a production management device and method for a component installing production line, so as to make equilibrium of the component installing production line be optimized in the way of shortening the total production line periodic time under the condition of a plurality of production tasks in one component installing production line. For each production task, the periodic time for a bottleneck installing machine in a plurality of installing machines (12) and the periodic time for installing an association machine are set, for each production task, the periodic time for a bottleneck installing machine and the periodic time for installing an association machine are compared and the longer periodic time is set as the production line periodic time for each production task. Furthermore, the production line periodic time of the plurality of production tasks is added to obtain the total production line periodic time as the actual total production time of a plurality of production tasks, via change of a part of a feeding device (16) the plurality of installing machines (12) among the installing machines (12), the component installing sequence of the production task is changed, so as to shorten the total production line periodic time, thereby optimizing the periodic time of the bottleneck installing machine of each production task.

Description

The production management device of part mounting production line and production management method
Technical field
The present invention relates to carry out production management device and the production management method that a plurality of production tasks are produced the part mounting production line of multiple component mounting board.
Background technology
Typically, the component mounting line is constituted, are arranged the parts mounted on a circuit board mounting apparatus for mounting the components associated with the machine operations associated with the installation (e.g., solder printing, adhesive applying apparatus, a reflux apparatus, inspection apparatus, etc.).For the productivity (handling capacity) that improves this part mounting production line; In patent documentation 1 (spy opens the 2009-111103 communique); Obtain the productive temp of each device (fitting machine closes online with installation) of constituent part mounting production line; As the bottleneck Unit Installation condition of the maximum device of productive temp etc., reduce the productive temp of bottleneck device through change in the scope that can keep lowest quality.
Patent documentation
Patent documentation 1: the spy opens the 2009-111103 communique
The technology of above-mentioned patent documentation 1 is being produced on the part mounting production line under a kind of situation of component mounting board; Through reducing the productive temp of bottleneck device; Can improve productivity (handling capacity); But, on a part mounting production line, carry out a plurality of production tasks and produce under the situation of multiple component mounting board, may not tackle.This be because; Under the situation of carrying out a plurality of production tasks; (1) have situation about changing because of production task difference bottleneck device, (2) need make the mounting condition (feed appliance configuration etc.) of a plurality of fitting machines of constituent part mounting production line general in a plurality of production tasks.
In the arrangement of a plurality of parts mounting machine production line installation tasks to perform multiple production circumstances, may be considered to shorten the cycle time of a plurality of mounting apparatus of the total time (total cycle time), but, in addition to the installation of outside mounting machine association unit (e.g. solder printer, the adhesive coating apparatus, a reflux apparatus, inspection apparatus, etc.) become a bottleneck in the production tasks, no matter how to shorten the cycle time of mounting machine, a plurality of production tasks can not shorten the production time of the actual The total time (total production line cycle time).
When with Fig. 2 this reason being described, carrying out under the situation of 5 kinds of production tasks 1~5, in setting in the early stage, shown in Fig. 2 (a), be 150 seconds total cycle length of the bottleneck fitting machine of 5 kinds of production tasks 1~5, and adding up to production line cycle length is 165 seconds.Wherein, exist a plurality of installations to close under the online situation, it is that online cycle length is closed in the installation that becomes bottleneck (cycle length is for maximum) that a plurality of installations are closed in online that online cycle length is closed in the installation of each production task.In addition, the production line of each production task 1~5 is the cycle length of bottleneck fitting machine and installs the long time of closing in online cycle length cycle length.
In the setting before the optimization shown in Fig. 2 (a); A part of feed appliance in a plurality of feed appliances of the bottleneck fitting machine that is installed on production task 1,3,5 is moved to other fitting machine; In the configuration optimization that makes the feed appliance configuration of each fitting machine, pick-up nozzle and after changing the part erection sequence of each production task, shown in Fig. 2 (b), the total of the bottleneck fitting machine of 5 kinds of production tasks 1~5 shortens cycle length; But; On the contrary, add up to the total production line of production line cycle length of each production task 1~5 elongated cycle length, productivity reduces.
Summary of the invention
Therefore; Problem to be solved by this invention is; A kind of production management device and production management method of part mounting production line are provided, and it can make the balanced optimization of part mounting production line with the mode that shortens the total production line cycle length when in 1 part mounting production line, carrying out a plurality of production tasks and producing multiple component mounting board.
For solving said problem; First aspect of the present invention provides a kind of production management device of part mounting production line; Its installation in the operation that is arranged with a plurality of fitting machines that part are installed to circuit substrate and carries out being associated with the part installation is closed and is carried out a plurality of production tasks on the online part mounting production line; Produce multiple component mounting board; It constitutes, and possesses: cycle length setup unit, online cycle length is closed in cycle length and the said installation of each production task being set the fitting machine that becomes bottleneck (cycle length for maximum) in said a plurality of fitting machine (below be called " bottleneck fitting machine ") respectively; Cycle length of the more said bottleneck fitting machine of each production task and said installation are closed online cycle length and be set at the cycle length that will grow the unit as production line cycle length of actual production time of each production task; The production line of said a plurality of production tasks added up to ask for cycle length add up to the production line unit of cycle length; The optimal treatment unit; Through the feed appliance of said a plurality of fitting machines is changed the part erection sequence that changes each production task between fitting machine; Shortening said total production line cycle length, thereby carry out optimized optimal treatment cycle length of the said bottleneck fitting machine that makes each production task.
Thus; On a part mounting production line, carry out a plurality of production tasks and produce under the situation of multiple component mounting board; Even it is elongated before than optimal treatment to total cycle length of having carried out the cycle length of the bottleneck fitting machine of each production task adding up to through optimal treatment; The mode that also can shorten cycle length with the total production line as actual total production time of a plurality of production tasks makes the balanced optimization of part mounting production line, can on a part mounting production line, produce multiple component mounting board expeditiously.
Here, in addition to install the associated mounting machine outside the machine for example: the solder printer, the adhesive coating apparatus, a reflux apparatus, inspection apparatus, etc., and can install the parts associated with the production line machines installed only to the number of units a table, you can set more than one.
Like second aspect of the present invention; In the part mounting production line, disposing a plurality of installations closes under the online situation; When cycle length, setup unit set to install closed online cycle length, close online cycle length as long as set the installation that becomes bottleneck that a plurality of installations close in online.
The present invention also can only carry out once optimal treatment, also can be like the third aspect of the invention, repeat optimal treatment up to add up to production line become cycle length the shortest till.Thus, can ask for the shortest total production line cycle length, can produce multiple component mounting board with top efficiency.
In addition, fourth aspect of the present invention will be put down in writing as the invention of " the production management method of part mounting production line " with the identical technological thought of invention essence of " the production management device of part mounting production line " of first aspect present invention record.
Description of drawings
Fig. 1 is the block diagram that schematically shows the formation of the part mounting production line in one embodiment of the invention;
Fig. 2 (a) be the bottleneck fitting machine of the 5 kind production tasks 1~5 of expression in the present embodiment cycle length, the figure that closes the setting example before online cycle length, the production line optimization of cycle length is installed, figure (b) is the figure of the setting example after the optimization of expression comparative example;
Fig. 3 be the expression optimal treatment of having carried out present embodiment 5 kinds of production tasks 1~5 the bottleneck fitting machine cycle length, install to close the figure of the setting example of online cycle length, production line cycle length;
Fig. 4 is the process flow diagram of treatment scheme of the program of expression multitask production line work evener;
Fig. 5 is the process flow diagram of the treatment scheme of expression optimal treatment program.
Symbol description:
11 ... Circuit substrate,
12 ... Transport path,
13 ... Solder printing machine (it is online that the pass is installed),
14 ... inspection device (installation related machines),
15 ... Reflux (it is online that the pass is installed),
16 ... Feed appliance,
17 ... Production management computing machine (cycle length setup unit, optimal treatment unit),
18 ... Fitting machine
Embodiment
Below, an embodiment who specializes the form that is used for embodiment of the present invention is described.
The formation of part mounting production line at first, is described based on Fig. 1.
In the transport path 12 of delivery circuit substrate 11, be arranged with and part be installed to a plurality of fitting machines 18 of circuit substrate 11 (A~D) and carrying out installs the operation that is associated with part a plurality of installations are closed online.Wherein the plurality of mounting correlation unit 13, for example, the solder printer, inspection apparatus 14, a reflux device 15, an adhesive coating apparatus and so on.
(be separately installed with the feed appliance 16 of feeding parts among the A~D) at each fitting machine 18.Not shown among the figure, (maintain part that absorption supplies with from feed appliance 16 on the installation head of A~D) and it is installed on one or more pick-up nozzles of circuit substrate 11 at each fitting machine 18.According to the accessory size of supplying with by feed appliance 16, kind etc., from different multiple pick-up nozzle such as nozzle diameter, change and be attached to each fitting machine 18 (pick-up nozzle of the installation head of A~D).
In the part mounting production line that as above constitutes, carry out multiple production task, produce multiple component mounting board.For example shown in Fig. 2 (a), under the situation of carrying out 5 kinds of production tasks 1~5, be respectively the cycle length of the bottleneck fitting machine of each production task 1~5 25 seconds, 40 seconds, 30 seconds, 35 seconds, 20 seconds, be 150 seconds total cycle length that they have been carried out adding up to.Wherein, the bottleneck fitting machine of each production task 1~5 be a plurality of fitting machines 18 (among the A~D) cycle length maximum fitting machine.
On the other hand, the installation of each production task 1~5 is closed and all is set at 30 seconds online cycle length.In this embodiment, the component mounting line, the configuration associated with a plurality of mounting machine (solder printing machine 13, inspection apparatus 14, a reflux device 15), so that the installation of the production tasks associated machine cycle time is associated with a plurality of mounting Machine a bottleneck (the maximum cycle time) associated with the installation of machine cycle time.
In addition, the production line of each production task 1~5 is the cycle length of bottleneck fitting machine and installs the long time of closing in online cycle length cycle length.
In the setting before the optimization shown in Fig. 2 (a); A part of feed appliance in a plurality of feed appliances 16 of the bottleneck fitting machine that is installed on production task 1,3,5 is moved to other fitting machine; In the configuration optimization of the configuration of the feed appliance that makes each fitting machine 18 16, pick-up nozzle and after changing the part erection sequence of each production task, shown in Fig. 2 (b), the total of the bottleneck fitting machine of 5 kinds of production tasks 1~5 shortens cycle length; But; On the contrary, elongated cycle length to the total production line that the production line of each production task 1~5 has carried out adding up to cycle length, productivity is low.
Visible from the optimal treatment result of the comparative example shown in Fig. 2 (b), in 3 production tasks 1,3,5, be lower than the cycle length of bottleneck fitting machine to install and close online cycle length, therefore, production line is 30 seconds cycle length.In these three production tasks 1,3,5; Even extended to 30 seconds the cycle length of bottleneck fitting machine; Production line is also constant cycle length; Therefore, as shown in Figure 3, in the optimal treatment of present embodiment; Prolong the cycle length through with the bottleneck fitting machine of three production tasks 1,3,5 in the scope that is no more than 30 seconds, carries out optimization with the mode that shortens cycle length that surpasses the bottleneck fitting machine that 2 production tasks 2,4 of closing online cycle length are installed cycle length of bottleneck fitting machine.
Carry out this optimization; Need surpass in the cycle length of bottleneck fitting machine installs in 2 production tasks 2,4 of closing online cycle length; A part of feed appliance in a plurality of feed appliances 16 that are installed on the bottleneck fitting machine is moved to other fitting machine 18, change the part erection sequence of each production task 1~5.Particularly, through multitask line balancing device, carry out optimal treatment with the method for following (1)~(3).
(1) operator sets the online cycle length of installation pass of each production task.
At this moment, it is possessed online cycle length of the unified unified set-up function that is set at the identical time is closed in the installation of each production task.In addition, close under online cycle length of the condition of different in that each production task is installed, also can possess individual settings to each production task the individual settings function of closing online cycle length is installed.The operator uses unified set-up function and individual settings function, and the two is set and installs under the situation of closing online cycle length, as long as the setting that makes the individual settings function than the setting of unified set-up function more preferably.
(2) multitask line balancing device relatively closes online cycle length with installing each production task the cycle length of bottleneck fitting machine, will be set at the production line cycle length as the actual production time of each production task than long cycle length.
(3) multitask line balancing device adds up to the total production line cycle length of asking for as the actual total production time of a plurality of production tasks cycle length to the production line of a plurality of production tasks; Through the part in the feed appliance 16 of a plurality of fitting machines 18 is changed the part erection sequence that changes each production task 18 of fitting machines; So that add up to production line to shorten cycle length, thereby carry out optimized optimal treatment cycle length of the bottleneck fitting machine that makes each production task.
For the setting before the optimization of 5 kinds of production tasks 1~5 shown in Fig. 2 (a); When carrying out the optimal treatment of present embodiment, as shown in Figure 3, be 153 seconds total cycle length of the bottleneck fitting machine of 5 kinds of production tasks 1~5; Total than the comparative example shown in Fig. 2 (b) is long 7 seconds 146 seconds cycle length; But in the optimal treatment of present embodiment, be 160 seconds total production line cycle length that the production line of each production task 1~5 has been carried out adding up to cycle length; Than the total production line weak point 170 seconds cycle length of the comparative example shown in Fig. 2 (b) 10 seconds, we can say that the actual total production time of a plurality of production tasks shortens.
The optimal treatment result of the optimal treatment result of the comparative example shown in the comparison diagram 2 (b) and present embodiment shown in Figure 3 is visible; In production task 1, be increased to 28 second from 20 seconds the cycle length of the bottleneck fitting machine of present embodiment (Fig. 3), still; Owing to close online weak point 30 seconds cycle length than installing; Therefore, the production line of production task 1 closes promptly 30 seconds online cycle length for installing cycle length, does not change.
In addition, in production task 2, reduced to 38 second from 43 seconds the cycle length of the bottleneck fitting machine of present embodiment (Fig. 3); But; Since than install closing 30 seconds online cycle length long, therefore, be the promptly 38 seconds cycle length of bottleneck fitting machine production line cycle length of production task 1.Thus, in present embodiment (Fig. 3), production line cycle length of production task 2, from comparative example [ Fig. 2 (b) ] 43 seconds reduced to 38 seconds.
In addition, in production task 3,5, be respectively the cycle length of bottleneck fitting machine 30 seconds, 25 seconds, do not surpass to install and close 30 seconds online cycle length, therefore, the production line of production task 3,5 closes promptly 30 seconds online cycle length for installing cycle length.
In addition, in production task 4, reduced to 32 second from 37 seconds the cycle length of the bottleneck fitting machine of present embodiment (Fig. 3); But; Since than install closing 30 seconds online cycle length long, therefore, be the promptly 32 seconds cycle length of bottleneck fitting machine production line cycle length of production task 1.Thus, in present embodiment (Fig. 3), production line cycle length of production task 4, from comparative example [ Fig. 2 (b) ] 37 seconds reduced to 32 seconds.Consequently; In present embodiment (Fig. 3); Be 160 seconds total production line cycle length that the production line of each production task has been carried out adding up to cycle length; Than the total production line weak point 170 seconds cycle length of the comparative example shown in Fig. 2 (b) 10 seconds, we can say that the actual total production time of a plurality of production tasks shortens.
More than the function of the multitask line balancing device of the present embodiment of explanation is through being realized by production management computing machine 17 (or other computing machine) execution graph 4 of part mounting production line and each program of Fig. 5.Below, the contents processing of each program of the multitask line balancing device of key diagram 4 and Fig. 5.
[ multitask line balancing device ]
The program of the multitask line balancing device of Fig. 4 is carried out before the work of beginning part mounting production line.After this program of starting, at first, in step 101, the operator uses unified set-up function to unify to be set in the online cycle length of installation pass of a plurality of production tasks of carrying out on the part mounting production line.Afterwards, get into step 102, in above-mentioned a plurality of production tasks; Judge whether to exist online different production task cycle length of closing of installing; If exist to install close online different production task cycle length, then get into step 103, the operator uses the individual settings function individually to set to install the installation of closing online cycle length of different production task to close online cycle length; Get into step 104, the optimal treatment program of execution graph 5.
In above-mentioned steps 102; There is not online different production task cycle length of closing of installing if be judged as; Then omit the processing (individual settings of online cycle length is closed in the installation of individual settings function) of above-mentioned steps 103, get into step 104, the optimal treatment program of execution graph 5.
[ optimal treatment ]
The optimal treatment program of Fig. 5 is the subroutine of in the step 104 of Fig. 4, carrying out, and performance is as the effect of said optimal treatment unit in the application's the claim scope.After this program of starting, at first,, be produced on the configuration of the general feed appliance of carrying out on the part mounting production line 16 that in a plurality of production tasks, uses, the configuration of pick-up nozzle in step 201.Afterwards, get into step 202, set the numbering n of optimized production task.Be set at production task 1 at first.
Afterwards, get into step 203, so that the mode that shortens of set-up time makes the part erection sequence optimization of production task n.Afterwards, get into step 204, calculating a plurality of fitting machines 18 (becomes the cycle length of maximum bottleneck fitting machine cycle length among the A~D).In the claim scope of processing performance as the application of step 101~103 of this step 204 and above-mentioned Fig. 4 said cycle length setup unit effect.
And; In next step 205; Whether the cycle length of judging the bottleneck fitting machine is longer online cycle length than the pass is installed; If the cycle length of bottleneck fitting machine is longer online cycle length than the pass is installed, then get into step 206, with the production line cycle length that is set at this production task n cycle length of bottleneck fitting machine.On the other hand,, then get into step 207, close the production line cycle length that is set at this production task n online cycle length installing if close below online cycle length for installing the cycle length of bottleneck fitting machine.
Afterwards, get into step 208, the production line of the production task n that calculates so far is added up to the total production line cycle length of asking for as the actual total production time of a plurality of production tasks cycle length.Afterwards, get into step 209, judge whether production task numbering n is the setting suitable with the quantity of production task; If not setting then returns above-mentioned steps 202, increase progressively production task numbering n; For production task next time, carry out above-mentioned optimal treatment (step 203~209).Thus, whole for a plurality of production tasks of on the part mounting production line, carrying out carry out optimal treatment (step 203~209) in order.
In the moment of whole optimal treatment of a plurality of production tasks that are through with; In above-mentioned steps 209, be judged as " being "; Then get into step 210, judge whether this total production line is shorter cycle length than the shortest production line that adds up to cycle length, or be not first.Wherein, the shortest production line that adds up to changes in the step 211 of next time cycle length, and still, initial value is set at the total production line cycle length as target.
In above-mentioned steps 210, add up under short situation production line cycle length than the shortest in the total production line cycle length that is being judged as this, or be under the first situation being judged as, get into step 211, change is the shortest to add up to production line cycle length.For example, as long as this total production line is set at the shortest new production line cycle length of adding up to cycle length.Afterwards; Get into step 212; Through the part in the feed appliance 16 of a plurality of fitting machines 18 is changed the part erection sequence that changes each production task 18 of fitting machines; So that add up to production line to shorten cycle length, afterwards, the production task of next time is repeated the processing of above-mentioned steps 201~209.
Thus; Mode stage ground to add up to production line to shorten cycle length carries out optimization; In above-mentioned steps 210; More than cycle length and be judged as under for the second time later situation, be judged as and tried to achieve the shortest total production line cycle length at the shortest production line that adds up in the total production line cycle length that is judged as this, finish this program.
Present embodiment according to above explanation; Close online cycle length with installing the cycle length of each production task being set the bottleneck fitting machine in a plurality of fitting machines 18 respectively; Cycle length to the cycle length of each production task comparison bottleneck fitting machine is online with the pass is installed also will be than the long production line cycle length that is set at each production task cycle length; And; Production line to a plurality of production tasks adds up to the total production line cycle length of asking for as the actual total production time of a plurality of production tasks cycle length; Through the part in the feed appliance 16 of a plurality of fitting machines 18 is changed the part erection sequence that changes each production task 18 of fitting machines; So that this total production line shortens cycle length; Thereby make optimization cycle length of the bottleneck fitting machine of each production task, therefore, on 1 part mounting production line, carry out a plurality of production tasks and produce under the situation of multiple component mounting board; Pass through optimal treatment; Even elongated before than optimal treatment to total cycle length of having carried out the cycle length of the bottleneck fitting machine of each production task adding up to, the mode that also can shorten cycle length with the total production line as actual total production time of a plurality of production tasks makes the balanced optimization of part mounting production line, can the multiple component mounting board of high efficiency production on 1 part mounting production line.
And, in the present embodiment, repeatedly carry out optimal treatment up to add up to production line become cycle length the shortest till, therefore, can ask for the shortest total production line cycle length, can produce multiple component mounting board the most efficiently.
But the present invention also can only carry out one time optimal treatment.Further, in this embodiment, the component mounting line associated with a plurality of attachment configured machines (the solder printing machine 13, inspection apparatus 14, a reflux device 15, etc.), however, the number of installed units associated machine is not limited to this, and set up only one station.
In addition, the present invention also can change the platform number of the fitting machine 18 that is disposed at the part mounting production line, or also can change quantity of the production task of in production task, carrying out etc., in the scope that does not break away from aim, can implement various changes.

Claims (4)

1. the production management device of a part mounting production line; Close a plurality of production tasks of execution on the online part mounting production line in the installation of the operation that is arranged with a plurality of fitting machines that part are installed to circuit substrate and carries out being associated with the part installation; Produce multiple component mounting board; It is characterized in that possessing:
Cycle length setup unit, online cycle length is closed in cycle length and the said installation of each production task being set the fitting machine that becomes bottleneck in said a plurality of fitting machine (below be called " bottleneck fitting machine ") respectively;
Cycle length of the more said bottleneck fitting machine of each production task and said installation are closed online cycle length and be set at the cycle length that will grow the unit as production line cycle length of actual production time of each production task;
The production line of said a plurality of production tasks added up to ask for cycle length add up to the production line unit of cycle length;
The optimal treatment unit; Through the feed appliance of said a plurality of fitting machines is changed the part erection sequence that changes each production task between fitting machine; Shortening said total production line cycle length, thereby carry out optimized optimal treatment cycle length of the said bottleneck fitting machine that makes each production task.
2. the production management device of part mounting production line as claimed in claim 1 is characterized in that,
The a plurality of installations of configuration pass is online on said part mounting production line,
Said cycle length, setup unit was when setting said installation and close online cycle length, set the installation that becomes bottleneck that said a plurality of installations close in online and closed online cycle length.
3. according to claim 1 or claim 2 the production management device of part mounting production line is characterized in that,
Said optimal treatment unit repeats said optimal treatment, up to said total production line become cycle length the shortest till.
4. the production management method of a part mounting production line; Close a plurality of production tasks of execution on the online part mounting production line in the installation of the operation that is arranged with a plurality of fitting machines that part are installed to circuit substrate and carries out being associated with the part installation; Produce multiple component mounting board; It is characterized in that
Online cycle length is closed in cycle length and the said installation of each production task being set the fitting machine that becomes bottleneck in said a plurality of fitting machine (below be called " bottleneck fitting machine ") respectively,
Online cycle length is closed in cycle length and said installation to the more said bottleneck fitting machine of each production task, and will be set at the production line cycle length as the actual production time of each production task than long cycle length,
The production line of said a plurality of production tasks added up to ask for cycle length add up to production line cycle length,
Through the feed appliance of said a plurality of fitting machines is changed the part erection sequence that changes each production task between fitting machine; Shortening said total production line cycle length, thereby carry out optimized optimal treatment cycle length of the said bottleneck fitting machine that makes each production task.
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