CN113902301A

CN113902301A - Design method and system for production line of mobile phone assembly workshop

Info

Publication number: CN113902301A
Application number: CN202111182348.3A
Authority: CN
Inventors: 赵荣丽; 邹广鑫; 刘强; 邹尚文; 俞爱林; 苏倩怡
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-01-07
Anticipated expiration: 2041-10-11
Also published as: CN113902301B

Abstract

The invention discloses a design method and a system for a production line of a mobile phone assembly workshop, and belongs to the technical field of flow production line design. The design method comprises a process flow analysis step, an assembly procedure station automation analysis step and a workshop production line forming step. The automatic analysis step of the assembly procedure stations comprises the steps of firstly, distributing all procedures to corresponding stations through a heuristic balance algorithm; the workstations are then sorted and given an automation possibility label of automation, semi-automation or zero automation. The system comprises a process flow analysis module, an assembly procedure station automation analysis module and a workshop production line forming module. According to the mobile phone assembly workshop layout design method, the problems that an existing mobile phone assembly workshop layout design method is complex and rapid adjustment of the mobile phone assembly workshop is not facilitated are solved through process flow analysis, automatic assembly procedure station analysis and workshop production line forming.

Description

Design method and system for production line of mobile phone assembly workshop

Technical Field

The invention relates to the technical field of flow production line design, in particular to a design method and a system of a production line of a mobile phone assembly workshop.

Background

China is a large 3C manufacturing country and occupies over 70% of global capacity, wherein mobile phone manufacturing accounts for 32% of the total capacity. The development of smart phones is accelerated by the progress of scientific technology, and the smart phones become an essential part for daily life and work of the public. As mobile phones bring various convenience to the development of activities such as entertainment, consumption, work, and study of people, the demand of consumers for diversification and individuation of mobile phones is becoming stronger. The mobile phone market has entered the stock market from the incremental market, the industry market is competitive, the life cycle of the mobile phone is shortened from two years to several months at present, the frequency of mobile phone product iteration is very rapid, and mobile phone manufacturers have to adopt a small-batch multi-variety production mode to respond to the market demand rapidly.

3C electronic product manufacturing belongs to labor-intensive industry, especially the cell-phone manufacturing link, and wherein the cost of labor proportion is great, has occupied 75% of the cost, and this part cost of labor mainly concentrates on the assembly section and the packing section of cell-phone manufacturing production back end. However, different handset models require different handset production lines for assembly and processing. At present, the research and development period of an automatic mobile phone production line is about 5 months, the life period of mobile phone products is about half a year, and the frequency of mobile phone updating requires that the mobile phone production line is designed and optimized in a very short time.

The mobile phone product has the typical characteristics of high frequency switching and urgent delivery. Personalized requirements are continuously increased, the updating frequency of mobile phones is high, the product specifications are multiple, delivery date is urgent, and the phenomenon of order insertion frequently occurs, and enterprises have to frequently change production lines, including equipment replacement, process switching, production parameter configuration, production plan adjustment and differentiated order execution, so as to meet the requirements of customers. On the other hand, the largest requirement of the user enterprise on the mobile phone assembly enterprise is whether its products can be delivered in time in volume. In the global manufacturing process, the shortage or delay of a certain product delivery will cause the domino effect of the manufacturing chain, and even directly concern the reputation and development prospect of enterprises. These two features present significant technical challenges to cell phone manufacturers.

The design of a mobile phone assembly workshop is an important part of the design of a manufacturing system, the differentiation requirements of a client site, capacity, cost control, a process path, legacy equipment and the like need to be met, and a customized design and implementation scheme is quickly formed, which is a premise and a basis for quick building and deployment of a production line, so that the optimization design of the workshop production line becomes an important technical support for realizing transformation upgrading and intelligent manufacturing of manufacturing enterprises. The layout design of the mobile phone assembly workshop is an important component of the design of the manufacturing system, influences the utilization rate of production line equipment, the beat and the efficiency of a production line, and is also closely related to the production capacity, the delivery cycle and the production cost of enterprises. The layout design of the mobile phone assembly workshop needs to reasonably plan personnel, machines and other manufacturing facilities so as to create the most effective layout scheme, but due to the complex relationship among the process flow, the equipment position and the personnel operation, the layout design method of the existing mobile phone assembly workshop is very complex, and is not beneficial to quickly adjusting the mobile phone assembly workshop.

Disclosure of Invention

In view of the above-mentioned drawbacks, an object of the present invention is to provide a design method for a mobile phone assembly workshop, which solves the problems of complex layout design method and inconvenience for rapid adjustment of the mobile phone assembly workshop in the prior art through process flow analysis, automatic analysis of assembly process stations, and workshop production line molding.

In view of the above drawbacks, another objective of the present invention is to provide a design system for a mobile phone assembly workshop, which solves the problems of complex layout design and inconvenience for rapid adjustment of the mobile phone assembly workshop in the prior art through process flow analysis, automatic analysis of assembly process stations, and workshop production line molding.

In order to achieve the purpose, the invention adopts the following technical scheme: a design method of a production line of a mobile phone assembly workshop comprises the following steps:

the process flow analysis step comprises:

a1: acquiring all working procedures in the mobile phone assembly process flow;

a2: the constraint between the analysis processes and the increase and decrease of the analysis processes;

when precedence constraint exists between two working procedures, the sequence between the two working procedures is not allowed to be interchanged; when there is no precedence constraint between two processes, the order between the two processes is allowed to be exchanged; when the working procedures have the increasability, the working procedures can be added into the actual process flow or deleted from the actual process flow according to the actual requirements;

and (3) automatic analysis of stations in the assembly process:

b1: distributing all the procedures to corresponding stations through a heuristic balance algorithm;

b2: sorting the workstations and assigning automated, semi-automated, or zero-automated automation possibility labels to the workstations;

a workshop production line forming step:

c1: obtaining production takt and production line quantity through production task requirements and a working system, wherein the production task requirements comprise annual output and target productivity per hour, the annual actual working time and the daily actual effective working time are obtained according to the working system of a workshop, the daily productivity is annual output/annual actual working time, the single-day productivity of each production line is hourly target productivity and daily actual effective working time, the production line quantity is daily productivity/single-day productivity of each production line, and the production takt is daily actual effective working time/single-day productivity of each production line;

c2: designing the working hours of all stations according to the automatic possibility label;

c3: calculating the mobile phone assembling vehicle according to the working hours of all the stationsThe number of equipment and workers required by the workshop production line is configured according to the working system of the workshop and the automation possibility label of the station; wherein the calculation formula of the number of the devices is

N_yThe actual effective working time per day t of the equipment is the number of the equipment_yIs calculated by the formula

Wherein c is the working hours of the stations, k is the product capacity requirement, k is equal to the annual output/the number of production lines, and f is the product yield; the number of workers is the working hour/production beat of the station;

c4: and (4) carrying out layout of a production line of the mobile phone assembly workshop according to the area of the workshop, the division of the area and the required equipment number to form a design scheme.

It should be noted that, the heuristic balancing algorithm in the step B1 is specifically: according to the beat requirement of a production line, distributing to a first station from a first procedure, and after the distribution of the first station is completed, distributing to subsequent stations until all procedures are distributed;

and when the corresponding working procedure is distributed to the stations, redundant time exists, the next working procedure is used for complementing, wherein when the next working procedure is complemented, the next working procedure is selected through the constraint performance among the working procedures.

Optionally, the step B2 further includes analyzing the possibility of each station automation operation according to the assembly process factors and detection process factors in the stations, and classifying the stations, wherein the assembly process factors include assembly part features, assembly space, assembly precision, assembly plane and position characteristics, and the detection process factors include detection mode and detection condition.

Specifically, the step C2 specifically includes: the time of day of a workstation assigned an automated automation possibility label is equal to the equipment time of the equipment executing the workstation;

the man-hours of a station to which a semi-automated automation possibility label is given are equal to the sum of the equipment man-hours, the manual man-hours, and the worker operation correction man-hours of the equipment that executes the station;

the man-hours of the stations endowed with the automatic possibility labels with zero automation are equal to the man-hours of labor plus the man-hours of operation correction of workers; and the worker operation correction working hours are the sum of the manual working hours multiplied by the comprehensive width ratio, the pick-and-place time of the mobile phone on the product production line and the pick-and-place time of the mobile phone under the product production line.

Preferably, the method further comprises a design scheme optimization step after the workshop production line forming step, wherein the design scheme optimization step is as follows:

establishing a simulation model according to the design scheme through simulation software, and then performing operation simulation on a production line of the mobile phone assembly workshop according to the simulation model to obtain the hourly simulation yield;

when the hourly simulation yield is smaller than the hourly target capacity after the simulation is operated, optimizing the design scheme, reestablishing a simulation model for the optimized design scheme, and performing the operation simulation of a production line of the mobile phone assembly workshop according to the simulation model; wherein the optimization of the design scheme specifically comprises: analyzing the working time proportion of each station, increasing the number of devices for the station with the automatic possibility label with the working time proportion of more than 80%, increasing the number of devices or workers for the station with the semi-automatic possibility label with the working time proportion of more than 80%, and increasing the number of workers for the station with the automatic possibility label with the working time proportion of more than 80%;

and outputting the design scheme as a final design scheme when the hourly simulation output is greater than or equal to the hourly target capacity after the simulation is run.

It is worth to say that, the design system of the production line of the mobile phone assembly workshop comprises a process flow analysis module, an assembly procedure station automation analysis module and a workshop production line forming module;

the process flow analysis module is used for acquiring all processes in the mobile phone assembly process flow; the method is also used for analyzing the constraint among the procedures and the increasability of the analysis procedures; the method is also used for preventing the sequence of the two procedures from being interchanged when the precedence constraint exists between the two procedures; the method is also used for allowing the sequence between the two procedures to be exchanged when no precedence constraint exists between the two procedures; the method is also used for adding the working procedures into the actual process flow or deleting the working procedures from the actual process flow according to the actual requirements when the working procedures have the increasability;

the assembly procedure station automatic analysis module is used for distributing all the procedures to corresponding stations through a heuristic balance algorithm; and also for sorting said workstations and assigning automation possibility labels to said workstations for automation, semi-automation or zero automation;

the workshop production line forming module is used for obtaining production beats and production line quantity through production task requirements and a working system, wherein the production task requirements comprise annual output and target productivity per hour, the actual working time per year and the actual effective working time per day are obtained according to the working system of a workshop, the productivity per day is the annual output/the actual working time per year, the single-day productivity of each production line is the target productivity per hour and the actual effective working time per day, the production line quantity is the productivity per day/the single-day productivity of each production line, and the production beats are the actual effective working time per day/the single-day productivity of each production line; the automatic possibility label is used for designing the working hours of all the stations according to the automatic possibility label; the mobile phone assembly workshop production line is also used for calculating the number of equipment and workers required by the mobile phone assembly workshop production line according to the working hours of all the stations, and configuring the equipment and the workers according to the working system of the workshop and the automation possibility labels of the stations; wherein the calculation formula of the number of the devices is

Where c is the number of work stations, k is the product capacity requirement, and k is equal to the annual output/production line numberQuantity, f is the product yield; the number of workers is the working hour/production beat of the station; and the mobile phone assembly workshop production line layout is also used for carrying out the layout of the mobile phone assembly workshop production line according to the area and the area of the workshop and the required equipment number to form a design scheme.

Optionally, the heuristic balancing algorithm of the assembly process station automation analysis module is specifically configured to start allocating to a first station from a first process according to a production line beat requirement, and perform subsequent station allocation after the allocation of the first station is completed until all processes are allocated; and the system is also used for complementing the next procedure when redundant time exists after the corresponding procedure is distributed to the stations, wherein when the next procedure is complemented, the next procedure is selected through the constraint property among the procedures.

Specifically, the assembly process station automation analysis module is further configured to analyze the possibility of automation operation of each station according to assembly process factors and detection process factors in the process, and classify the stations, wherein the assembly process factors include assembly part characteristics, assembly space, assembly precision, assembly plane and position characteristics, and the detection process factors include detection modes and detection conditions.

Preferably, when the workshop line molding module is used to calculate the man-hours of the respective stations based on the automation possibility labels, the man-hours of the stations to which the automation possibility labels are given are equal to the equipment man-hours of the equipment that executes the stations, and the man-hours of the stations to which the semi-automation possibility labels are given are equal to the equipment man-hours, the man-hours, and the man-hours of the automation possibility labels to which the sum of the worker operation correction man-hours is given zero automation, which is equal to the man-hours plus the worker operation correction man-hours; and the worker operation correction working hours are the sum of the manual working hours multiplied by the comprehensive width ratio, the pick-and-place time of the mobile phone on the product production line and the pick-and-place time of the mobile phone under the product production line.

The design scheme optimization module is used for establishing a simulation model according to the design scheme through simulation software and performing operation simulation on a production line of the mobile phone assembly workshop according to the simulation model to obtain the hourly simulation yield; the simulation system is also used for optimizing the design scheme when the hourly simulation yield is smaller than the hourly target capacity after simulation operation, reestablishing a simulation model for the optimized design scheme, and then performing operation simulation on a production line of the mobile phone assembly workshop according to the simulation model; the system is also used for analyzing the working time proportion of each station, increasing the number of devices for the station endowed with the automatic possibility label with the working time proportion of more than 80 percent, increasing the number of devices or workers for the station endowed with the semi-automatic possibility label with the working time proportion of more than 80 percent, and increasing the number of workers for the station endowed with the automatic possibility label with the zero automation with the working time proportion of more than 80 percent; and outputting the design scheme as a final design scheme when the hourly simulation output is greater than or equal to the hourly target capacity after the simulation is run.

One of the above technical solutions has the following beneficial effects: the production line of the mobile phone assembly workshop is reasonably designed through process flow analysis, automatic analysis of assembly procedure stations and workshop production line forming, so that the production bottleneck is eliminated, the production efficiency is improved, the production cost is reduced, and the production period is shortened, so that the mobile phone assembly workshop can be quickly adjusted, and the design capability and the automation level of the production line of the mobile phone assembly workshop are quickly improved.

Drawings

FIG. 1 is a flow chart of one embodiment of the present invention;

FIG. 2 is a flow chart of design optimization steps of one embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

As shown in fig. 1 and 2, a design method of a production line of a mobile phone assembly plant includes the following steps:

the process flow analysis step comprises:

a1: acquiring all working procedures in the mobile phone assembly process flow;

specifically, the process flow of the production line of the mobile phone assembly workshop is an important basis for designing the production line of the mobile phone assembly workshop, and a designer needs to consider a flexible space when designing a flexible production line so as to quickly extract a common process during production change, determine an individual process, plan a reasonable process flow, ensure the assembly quality and the assembly efficiency and shorten the time required by production change. The procedures in the basic assembly process flow of the mobile phone can be divided into an assembly procedure section and a detection procedure section, wherein the assembly procedure section comprises an assembly screen surface shell, an assembly main board, a lock main board screw, an assembly bottom shell, a buckling bottom shell and a lock screw; the detection process section comprises appearance inspection, function test, coupling test and appearance general inspection. In actual mobile phone assembly, the sequence and logic between the working procedures are reasonably planned according to actual mobile phone products, so the relation between basic assembly processes needs to be fully considered, namely the constraint between the working procedures needs to be fully considered, and the flexible space of the assembly process needs to be analyzed. The basic structure of the mobile phone comprises a face shell, a mainboard and a bottom shell, and the assembly of the face shell, the mainboard and the bottom shell follows the principle of 'firstly covering the face shell, then covering the mainboard and finally covering the bottom shell'. Considering the constraint performance among the working procedures, the constraint relations of fastening the front and the back exist between the assembling main board and the lock main board screw, between the assembling bottom shell and the buckling bottom shell and between the buckling bottom shell and the lock screw respectively, and the sequence is not allowed to be interchanged; the functional test and the coupling test are two independent detection processes, the two processes have no sequential constraint, and the sequence is allowed to be exchanged. In view of the increase of the process, the assembly of the mobile phone product with high quality requirement usually adds a quality inspection link after a key link to ensure the assembly quality. Therefore, corresponding quality inspection processes can be added between the assembled screen panel shell and the assembled main board and between the lock main board screw and the assembled bottom shell; in addition, the mobile phone product with the personalized function can add a test process with the corresponding function in the detection process section. From the viewpoint of process reducibility, the appearance inspection is the appearance inspection before the mobile phone assembly process section is finished and enters the detection section, and actually, the appearance general inspection comprises the operation task of the appearance inspection, so that whether the process with certain repeatability and low necessity is skipped can be selected according to the actual requirement.

And (3) automatic analysis of stations in the assembly process:

b2: sorting the workstations and assigning automated, semi-automated, or zero-automated automation possibility labels to the workstations; specifically, the process is the sequence and steps of the production process, and the station is the tooling location for completing the process. After the work station is allocated, an automation possibility label is given to the work station according to the work content of the work station or the difficulty level of realizing automation, and the automation possibility label is corresponding to the work station.

Wherein the automated automation possibility label represents that the workstation is performed entirely by the equipment, the semi-automated automation possibility label represents that the workstation is performed by both the equipment and the worker, and the zero-automated automation possibility label represents that the workstation is performed entirely by the worker. In this embodiment, the station division obtained through step B2 is shown in table 1:

TABLE 1

A workshop production line forming step:

line tact refers to the market cost of assembling a product on a complete line, determined by the line throughput. The production task requirement and the working system are components of the existing factory management, wherein the production task requirement comprises annual output and target capacity, the working system comprises monthly working time, shift, time per shift, average frequency of production change, daily maintenance of equipment, shift material preparation, shift rest time and line change time, and the actual working time of the whole year and the actual effective working time of each day are obtained through the working system and are the existing factory managementAnd in a statistical manner, the annual actual working time is the working days after the rest days and holiday days are removed, and the daily actual effective working time is the daily maintenance time of the removing equipment, the shift material preparation time, the shift rest time and the daily working hours after the line changing time. In this embodiment, the production task of the mobile phone assembly workshop requires 1000 thousands of annual output, the target hourly capacity of the production line of the mobile phone assembly workshop is 200, and the working system of the workshop is as follows: the monthly working time is 26 days/month, the number of shifts is 2 shifts/day, the time of each shift is 7 hours, the average production change frequency is 4 days/shift, the daily overhaul of the equipment is 10 minutes/day, the material preparation time of the shift is 10 minutes, the rest time of the shift is 15 minutes, and the line change time is 18 minutes. According to the requirements of workshop production tasks, the annual tasks of the workshops need to reach 1000 thousands of tasks. The working time of the workshop is 312 days, the actual working time of the whole year is about 300 days by considering various festivals and holidays, and the daily capacity of the workshop is 33334 to meet the design requirement. The actual effective working time of the workshop every day is 13 hours, the single-day capacity of each production line is about 2600, and the number of the production lines can be calculated to be 13. By the formula

And calculating to obtain the target production rhythm of the production line as 18 seconds, wherein CT is the production rhythm, T is the actual effective working time per day, and Q is the daily capacity of each production line. See table 2 for the production line design details of the mobile phone assembly plant:

TABLE 2

c3: calculating the number of equipment and workers required by a production line of a mobile phone assembly workshop according to the working hours of all the stations, and configuring the equipment and the workers according to the working system of the workshop and the automation possibility labels of the stations; wherein the calculation formula of the number of the devices is

in this embodiment, the equipment rotation rate is 90%, the product reject ratio is 5%, the product yield is 95%, and the equipment and the worker are configured based on the work system of the workshop. Annual operating time T of the installation_yIs expressed as T_y3600 equipment transfer rate per year of active working time. And designing according to the production task and the working hours of all the stations, and calculating the number of equipment and workers required by a production line of the mobile phone assembly workshop. The mobile phone assembly workshop production line adopts the manipulator to realize the grabbing and releasing of the mobile phone on the product production line and under the product production line, so that the station endowed with the automatic possibility label does not need to be configured with workers, the actual working hours comprise the equipment processing time and the manipulator working time, the quantity rounding is carried out by adopting the rounding principle, the required equipment quantity is shown in a table 3, and the rounding is the actually required equipment quantity.

TABLE 3

Work station	Required equipment	Required amount of	Round and tidy
				TP BackGlue	Rubberizing equipment	0.89	1
Press fit TP	Press fitting equipment	1.06	1
				Get mainboard and paste mainboard sealing bubble cotton	Material sticking equipment	1.11	1
Battery cover press fit	Press fitting equipment	1.33	1
				Current testing	Current detection jig	4.3	4
Camera test	Camera detection device	1.48	1
				Audio testing	Audio detection device	2.8	3
Coupling test	Coupling detection device	3.3	3
				Ultra wide angle testing	Ultra-wide angle detection equipment	1.8	2
MMI testing	MMI detection equipment	3.8	4
				Taking after being loaded	Rear camera mounting device	1.18	1
Grounded conductive sponge and mounting motor	Material sticking and mounting equipment	2.00	2
				Mounting main and auxiliary FPC and pressing	Press fitting equipment	1.19	1
Installing a bracket and a lock screw	Screw locking device	1.43	1
				Assembled battery and battery roll	Battery rolling equipment	1.57	2
FPC (flexible printed circuit) for installing battery and pressing battery	Press fitting equipment	1.02	1
				Lower bracket and locking screw	Screw locking device	1.00	1
Installation fingerprint module and pressfitting	Press fitting equipment	0.91	1

The number of workers is calculated by only considering the stations endowed with semi-automation and zero-automation, and according to the number of workers, namely the working hour/production rhythm of the stations, and based on the rounding principle, the number of workers is shown in the table 4, wherein the number of workers is rounded to the number of workers actually needed.

TABLE 4

Specifically, the configuration of the devices and workers is performed according to the work system of the plant and the automation possibility labels of the workstations, for example, the devices corresponding to the workstations to which the automation possibility labels are given need not be configured by the workers, and only the devices corresponding to the workstations to which the automation possibility labels are given by the semi-automation and the automation possibility labels with the zero automation need to be considered to be configured by the workers. In addition, workers are configured by combining the monthly working time, the shift, the time per shift, the average production change frequency, the daily overhaul of equipment, the preparation of shift materials, the shift rest time and the line change time in a working system.

In this embodiment, the length of the workshop is 80 meters, and the division of the area includes production and manufacturing, personnel's official working, finished product of material and transport means and places the district. The mobile phone assembling workers are many, the flow of people is large, safety is considered, 2.5-meter channels are reserved in front of and behind a workshop, and 2-meter safety intervals need to be kept among areas. The mobile phone has more parts for assembling, the supplies are frequently supplied, and a 2-meter material carrying channel interval is reserved between the lines. The number of production lines required to be configured in a workshop is 13, so that the number of the production lines is large. The production rhythm of the mobile phone is short and compact, the flow direction of the mobile phone in the product is single, only one material finished product area is arranged in a workshop, comprehensive consideration is given, and the production line is linear. The distribution interval between the devices is 0.3 m, the width of the worker seat is 0.5 m, the total width of the wire body is 3.5 m, and the total length is 51 m. The production line of 13 mobile phone assembly workshops is not enough to be placed by adopting horizontal arrangement according to the size of a manufacturing area, so that the vertical layout is adopted. The invention takes a mobile phone assembly line as a design object. At present, two production line architecture forms are commonly used in mobile phone manufacturing enterprises: plug and play and cell. The two production line architectures have respective advantages and disadvantages, and the design of the production line workshop selects the architecture form according to the requirements of enterprises. The invention selects the plug-and-play mode to design the assembly line, and the design and optimization method of the unit type mobile phone assembly line can also refer to the invention.

Production line operation mode: the plug-and-play production line is characterized in that the online cache of the offline production line is realized, the total processing time of the working procedures comprises the processing time of the working position working procedures and the time of grabbing and placing products back and forth by the feeding and discharging mechanism, and the production takt is low; the unit type production line is characterized in that the on-line production line is cached in a lower mode, after the work-in-process is processed in each unit, the work-in-process is directly transmitted to the next station or a line edge cache region to wait, the time for manual transmission and placement of the work-in-process is extremely short, and the production beat is high.

Automated equipment: the plug-and-play production line adopts plug-and-play equipment, has a set of standardized interface system, an actuating mechanism and can be customized and designed according to requirements, a universal platform can be produced in batch, and the price is relatively low; the processing equipment of unit type production line is different in size and manufacturer, and is not purchased in batch production, and the equipment cost is relatively high.

The wire changing mode comprises the following steps: the plug-and-play production line uses a universal platform with standardized and modularized interfaces, and the base adopts a concave design, so that automatic transport and disassembly of equipment by an AGV can be realized, and the production line is constructed and changed quickly; each independent unit of the unit type production line is carried and spliced by workers, and the production line is long in construction and line changing time.

When a scheme is designed, a proper production line design scheme needs to be selected according to actual assembly requirements of different mobile phone products, so that the quality of the production line design scheme needs to be evaluated, and common key parameters include production beat, balance rate, balance loss, cost of evaluation indexes and the like.

In the design method of the mobile phone assembly workshop production line, the mobile phone assembly workshop production line is reasonably designed through process flow analysis, assembly procedure station automation analysis and workshop production line forming, so that the method is favorable for eliminating the production bottleneck and improving the production efficiency, and can also reduce the production cost and shorten the production period, thereby being favorable for quickly adjusting the mobile phone assembly workshop and quickly improving the design capability and automation level of the mobile phone assembly workshop production line.

In some embodiments, the heuristic balancing algorithm in step B1 is specifically: according to the beat requirement of a production line, distributing to a first station from a first procedure, and after the distribution of the first station is completed, distributing to subsequent stations until all procedures are distributed; and when the corresponding working procedure is distributed to the stations, redundant time exists, the next working procedure is used for complementing, wherein when the next working procedure is complemented, the next working procedure is selected through the constraint performance among the working procedures. Specifically, the present embodiment uses a heuristic balancing algorithm to arrange the workstation processes. The idea of the heuristic balance algorithm is as follows: according to the rhythm requirement of a production line, the working procedure content of the working positions is determined by allocating the working positions to a first working position from a first working procedure, and supplementing the working positions by a next working procedure if redundant time exists, wherein the whole assembly process of the mobile phone and the association and constraint relation among the working procedures need to be considered, wherein the association and constraint relation is the constraint performance among the working procedures, such as assembling a support, locking screws in the next step, and the working positions are allocated to the working procedures by adopting the principle of the following working positions. The dimension of realizing automation of each procedure is comprehensively considered for factors such as the characteristics of assembly parts, the assembly space, the assembly precision, the assembly plane, the position characteristics and the like of the assembly procedure and factors such as the detection mode and the condition of the detection process.

It should be noted that step B2 further includes analyzing the possibility of each station automation operation according to the assembly process factors and the detection process factors in the stations, and classifying the stations, wherein the assembly process factors include the characteristics of the assembly parts, the assembly space, the assembly precision, the assembly plane and the position, and the detection process factors include the detection mode and the detection condition. For example, when the start key is assembled, the side surface is assembled, the clamp is difficult to clamp, the start key is fine, the shape is irregular, automation is difficult to realize, and a label with zero automation is provided; when the sponge is attached and the motor is installed, the sponge and the motor are regular in shape and smooth in assembly position, and automatic labels are given.

Optionally, the step C2 is embodied as that the labor hour of the station endowed with the automatic automation possibility label is equal to the equipment labor hour of the equipment for executing the station; present cell-phone assembly plant is produced line equipment and is referred to table 5:

TABLE 5

Device name	Equipment man-hour (second)	Equipment size (rice)	Univalent (ten thousand)
				Rubberizing equipment	Design man-hour	1.1×1.0	10
Press fitting equipment	Design man-hour	1.1×1.0	10
				Current detection jig	80	1.1×1.0	10
Camera detection device	160	1.0×1.0	10
				Audio detection device	50	1.1×1.0	10
Coupling detection device	60	1.1×1.0	10
				Ultra-wide angle test equipment	30	1.1×1.0	10
Screw locking device	Design man-hour	1.1×1.0	10
				MMI detection equipment	70	1.1×1.0	10
Material sticking equipment	Design man-hour	1.1×1.0	10
				Rear camera mounting device	17.6	1.1×1.0	10
Material sticking and mounting equipment	36	1.1×1.0	10
				Double-layer conveyor belt	3	51×3	6
TrayTurnover circulation equipment	15	0.7×0.5	0.9

First, the station with the automatic possibility label assigned to the four undetermined man-hours in table 5 is subjected to equipment modeling and man-hour design, and the results are shown in table 6:

TABLE 6

The man-hours of a station to which a semi-automated automation possibility label is given are equal to the sum of the equipment man-hours, the manual man-hours, and the worker operation correction man-hours of the equipment that executes the station; see table 7:

TABLE 7

See table 8:

TABLE 8

In actual production in a workshop, workers do not work continuously, and can not finish the production within a specified time due to the influence of various factors, including physiological requirements of the workers, long-time working fatigue, insufficient technical proficiency and the like. Therefore, a certain extra time length needs to be added on the basis of the working hours, and the wide-spread is given, so that the comprehensive wide-spread rate is introduced to express the additional extra time length. Specifically, a skilled worker is selected to perform five times of simulation operation, the working hours are measured and averaged, and the working hours of the worker are obtained. The sum of the holding and releasing time of the mobile phone on the product line and the holding and releasing time of the mobile phone under the product line is known to be 6 seconds, the main FPC and the auxiliary FPC are pressed for 5 seconds, the upper support screw locking pair and the lower support screw locking pair are 5 seconds, the battery is rolled for 19 seconds, the battery is pressed for 5 seconds, the fingerprint module is pressed for 3 seconds, and the comprehensive width ratio, the holding and releasing time of the mobile phone on the product line and the holding and releasing time of the mobile phone under the product line are required to be corrected in working hours in a mobile phone assembly workshop. Preferably, the comprehensive widening rate is 5%, and when the comprehensive widening rate exceeds 5%, the production rhythm is increased, the yield is lowered, and the cost is increased; when the comprehensive widening rate is lower than 5%, the working pressure of workers is increased, the widening effect cannot be achieved, and the actual working time of the workers cannot be properly reflected.

Specifically, the method further comprises a design scheme optimization step after the workshop production line forming step, wherein the design scheme optimization step is as follows: establishing a simulation model according to the design scheme through Demo 3D simulation software, and then performing operation simulation on a production line of a mobile phone assembly workshop according to the simulation model to obtain the hourly simulation yield; when the hourly simulation yield is smaller than the hourly target capacity after the simulation is operated, optimizing the design scheme, reestablishing a simulation model for the optimized design scheme, and performing the operation simulation of a production line of the mobile phone assembly workshop according to the simulation model; wherein the optimization of the design scheme specifically comprises: analyzing the working time proportion of each station, increasing the number of devices for the station with the automatic possibility label with the working time proportion of more than 80%, increasing the number of devices or workers for the station with the semi-automatic possibility label with the working time proportion of more than 80%, and increasing the number of workers for the station with the automatic possibility label with the working time proportion of more than 80%; and outputting the design scheme as a final design scheme when the hourly simulation output is greater than or equal to the hourly target capacity after the simulation is run.

As shown in fig. 2, a specialized model library is first built. Relevant models are built by using tools such as Solidswork and the like, and a production line model library of the mobile phone assembly workshop is built after lightweight processing of the models, wherein the production line model library comprises a special machine equipment library, a storage and transportation equipment library and a personnel material library. And then, according to the linear type and station division conditions of the production line, connecting all stations according to a logic sequence, and establishing a static model of the production line of the mobile phone assembly workshop. And then writing an action script. The static model can only reflect the appearance structure, the shape and the position relation of the production line, cannot reflect the actual production operation of the production line, and is lack of authenticity. Corresponding action and motion scripts can be compiled, equipment machining actions and product flow are simulated, and simulation visualization is achieved. The relevant attribute variables are then defined. The production line production comprises various production data, and related variables are defined to record and store the data respectively. And defining the Working state of the station, wherein the Working state of the station comprises Working time duty Working, Idle time duty Idle, blocking time duty Block and equipment maintenance time duty Maintain, defining attributes such as processing time ProcessTime, Idle time IdleTime, equipment failure time MTTF and equipment maintenance time MTTR, and defining the starting statistical time StartTime of the number of finished mobile phone products in the scene Custom attribute. And finally, setting parameters, setting ProcessTime, MTTF, MTTR and StationaNum in the Custom attribute of each process based on the working hours of each process, and initializing the process state. The method comprises the steps that a Counter component in a software Data Collection library is used as a mobile phone quantity Counter, a time instatte component is used as a station working time, idle time, blocking time, equipment failure time and equipment maintenance time calculator, wherein the sum of the working time, the idle time, the blocking time and the equipment maintenance time is total time, the working time is working time/total time, the idle time is idle time/total time, the blocking time is blocking time/total time, and the equipment maintenance time is equipment maintenance time/total time. And setting the starting statistical time of the production line product quantity in the operation scene Custom attribute panel. After the simulation is operated, the hourly simulation yield of the design scheme of the production line of the mobile phone assembly plant is 148, which is less than the hourly target capacity of 200, and the simulation conditions are subjected to data statistics, which is shown in table 9:

TABLE 9

Analysis shows that the average idle rate of the stations is 32.66%, wherein the idle rates of TP back glue, TP back glue paper heat dissipation sheet films, fingerprint module installation and TP pressing are all over 40%; the average work rate is 67.34%, wherein the work rate of 8 stations is greater than the average work rate, and the work rate comprises current test, battery assembly and battery rolling, battery installation FPC and battery pressing, Camera test, battery cover pressing, coupling test, appearance total inspection, number scanning and boxing. The working time of the FPC and the battery laminating station for installing the battery and the Camera test is more than 90%, and the working time of the two stations is longer than that of other stations, which means that the working time of the two stations is longer than that of other stations, namely, the working time of the former station is finished, the former station is still working, and the former station has a blockage phenomenon. The maximum working time is selected from the working times obtained by the timeinstatte assembly and is used as the bottleneck working time, the station corresponding to the bottleneck working time is the bottleneck station, and in this embodiment, the bottleneck station time is 26.67 seconds. The production line balance rate was 84.33%, and the balance loss rate was 15.67%, where the production line balance rate was the sum of the standard man-hours of each station/(the total bottleneck station time station number) 100%, and the production line balance loss rate was 1 — production line balance. The line balance is also called synchronization of processes, and is a process for averaging all production and manufacturing processes by indicating the line balance rate, and the idle or blockage caused by the imbalance between the operations is reduced by adjusting the operation load. The balance loss refers to the production loss of the production line caused by the unbalance of the production line and is expressed by the balance loss rate of the production line.

There is therefore also a need for improvements in the design. The method for improving the balance of the production line comprises the steps of adding the number of equipment or workers, improving the availability of the equipment or the processing rate of operation work, and minimizing the production cycle time. According to the processing condition of the production line, the processing rates of Camera test, battery assembling and battery rolling, battery cover lamination, battery FPC assembling and battery lamination are as high as over 80 percent, which shows that the four processing times are long, and the four processing times are in a working state for a long time and are bottleneck links of the production line. Wherein, the two procedures of Camera test, battery assembly and battery rolling are more than 90%. Therefore, the two aspects are taken as the key points for improving the production line, and the optimization research is carried out on the balance of the production line.

First, optimization improvement is performed on the Camera test station. The Camera test station is a process to which an automated possibility label is given, and is completed by a Camera detection device, so that one Camera detection device is added to the station. Secondly, improve assembled battery and battery roll extrusion station, this process is endowed with semi-automatization automation possibility label, includes assembled battery and battery roll extrusion two parts, and there is the precedence constraint between the process. It is known that the average working time of the assembled battery is 8.95s, and the battery rolling time is 16s when the assembled battery is finished by workers, so that a worker or a rolling device is added optionally. In view of long-term cost, the cost of the equipment is lower than the wage cost of workers, the actual battery rolling time is longer, the target production rhythm of a production line is not met, and the optimization improvement is realized by adding one battery rolling equipment in comprehensive consideration. And finally, modifying the simulation model, and setting 1-hour simulation time to obtain 194 simulation yields per hour, but not meet 200 target productivity per hour, so that secondary optimization is required.

The battery cover press-fit station is then optimized. The process is provided with an automated possibility label, which is completed by the laminating device, so that the process is added with the laminating device. Modifying simulation model parameters, setting simulation time, simulating operation simulation, and optimizing simulation yield, wherein the result of the simulation yield is 221 per hour and is far higher than 200 per hour of target production capacity.

After optimization, the busy rate of all three stations is reduced. At the moment, the bottleneck station time is 17.96 seconds, the balance rate of the production line is 87.09 percent, and the balance loss rate is 12.98 percent. In fact, the production line production is influenced by the operation of the workshop, so that various influencing factors of the workshop operation need to be comprehensively considered to simulate the production line. In the embodiment, the actual operation of the workshop production line in one year is simulated by comprehensively combining factors such as line changing time, material supplement of the workshop production line and the like.

According to the working system of the workshop, the average production change time of a production line of the mobile phone assembly workshop is 18 minutes every time, the average annual line change frequency is 4 days, and the production change time of the workshop for one year is 1350 minutes; the material supplementing frequency of each production line station is once every shift, the material supplementing time is 5 minutes every time, and the material supplementing consumption of an assembly workshop for one year is 39000 minutes. 13 mobile phone assembly workshop production lines are established based on the optimization scheme of the production lines, a mobile phone assembly workshop production line model is established, workshop production change and material supplement are integrated, one-year production of the assembly workshop is simulated, the optimized result obtained by running simulation is 10009354, and annual output is met.

And (3) scheme comparison:

the production tact of the production line of the optimized mobile phone assembly workshop is reduced to 17.96 seconds, the balance rate is improved by nearly 4%, the balance loss is reduced, the balance of the production line is effectively improved, and the design scheme meets the production task target of the production line target capacity and the workshop. In fact, the simulation model aims to simulate the production conditions of the production line of the workshop before and after optimization, so the scheme before and after optimization is evaluated and compared according to the construction cost, the unit area capacity and the mobile phone assembly cost of the production line of the mobile phone assembly workshop. The cost includes the construction cost of the production line and the operation cost of the production line, and the construction cost of the production line in the design of the production line is taken as a consideration object in this embodiment, and then the construction cost of the production line includes the wage cost of equipment and workers, i.e. C₀＝C₁+C₂，C₀For the construction cost of the production line, C₁To the cost of the equipment, C₂Which is a salary cost for workers.

(1) Construction cost of production line

From formula C₀＝C₁+C₂It can be seen that the construction cost of the production line includes equipment acquisition cost and worker cost. The number of equipment is increased after optimization, and the number of personnel is not increased, so the construction cost of the production line before and after optimization is calculated. And one Camera detection device, one battery rolling device and one battery cover laminating device are added after optimization, the device acquisition cost of a production line before optimization is 433.5 ten thousand yuan, and the device acquisition cost after optimization is 463.5 ten thousand yuan. Device list see table 10:

watch 10

The number of workers is not increased before and after optimization, so the cost of the workers is the same. The mobile phone worker calculates according to the wage standard of 25 yuan/h. Each worker was given a shift per day according to the work schedule of the workshop, with the worker's wages being 4,550 yuan/month. The production line is provided with 38 workers, and the wage cost of workers in one year is 414.96 ten thousand yuan. The equipment configuration cost of a mobile phone assembly plant production line is about 453.5 ten thousand yuan. Therefore, the construction cost of a production line of a mobile phone assembly workshop is 848.46 ten thousand yuan. In conclusion, the construction cost of the production line before optimization is 848.46 ten thousand yuan, and the construction cost after optimization is 878.46 ten thousand yuan.

(2) Capacity per unit area

Because 13 mobile phone assembly workshop production lines need to be arranged, the occupied area of the workshop is 178.5, the yield of one mobile phone assembly workshop production line is 148 tables before optimization, and the unit area capacity of the production line is about 0.83; the optimized yield is 221 tables, and the productivity per unit area is about 1.23.

(3) Cost of mobile phone assembly

The construction cost of the production line and the productivity of unit area are combined, the assembly cost of the mobile phone is calculated, each mobile phone is 0.115 yuan before optimization, and each mobile phone is 0.11 yuan after optimization.

Although the construction cost of the production line is increased after optimization, the productivity per unit area is increased, and the utilization of workshop sites is more effectively utilized. In addition, the assembly cost of the mobile phone is effectively reduced, and the overall production efficiency and benefit of a production line and a workshop are effectively improved.

the workshop production line forming module is used for obtaining production beats and production line quantity through production task requirements and a working system, wherein the production task requirements comprise annual output and target productivity per hour, the actual working time per year and the actual effective working time per day are obtained according to the working system of the workshop, the productivity per day is the annual output/the actual working time per year, the single-day productivity of each production line is the target productivity per hour and the actual effective working time per day, the production line quantity is the productivity per day/the single-day productivity of each production line, and the production beats are the actual effective working time per day/the single-day productivity of each production lineThe capacity is generated in one day; the automatic possibility label is used for designing the working hours of all the stations according to the automatic possibility label; the mobile phone assembly workshop production line is also used for calculating the number of equipment and workers required by the mobile phone assembly workshop production line according to the working hours of all the stations, and configuring the equipment and the workers according to the working system of the workshop and the automation possibility labels of the stations; wherein the calculation formula of the number of the devices is

Wherein c is the working hours of the stations, k is the product capacity requirement, k is equal to the annual output/the number of production lines, and f is the product yield; the number of workers is the working hour/production beat of the station; and the mobile phone assembly workshop production line layout is also used for carrying out the layout of the mobile phone assembly workshop production line according to the area and the area of the workshop and the required equipment number to form a design scheme.

In some embodiments, the heuristic balancing algorithm of the assembly process station automation analysis module is specifically configured to allocate the first station from the first process according to the production line beat requirement, and then allocate the subsequent stations after the allocation of the first station is completed until all the processes are allocated; and the system is also used for complementing the next procedure when redundant time exists after the corresponding procedure is distributed to the stations, wherein when the next procedure is complemented, the next procedure is selected through the constraint property among the procedures.

Optionally, the assembly process station automation analysis module is further configured to analyze the possibility of automation operation of each station according to assembly process factors and detection process factors in the station, and classify the stations, wherein the assembly process factors include assembly part characteristics, assembly space, assembly precision, assembly plane and position characteristics, and the detection process factors include detection modes and detection conditions.

Specifically, when the workshop production line molding module is used to calculate the man-hours of the respective stations from the automation possibility labels, the man-hours of the stations to which the automation possibility labels are given are equal to the equipment man-hours of the equipment that executes the stations, and the man-hours of the stations to which the semi-automation possibility labels are given are equal to the equipment man-hours, the man-hours, and the man-hours of the automation possibility labels to which the sum of the worker operation correction man-hours is given zero automation, which is equal to the man-hours plus the worker operation correction man-hours; and the worker operation correction working hours are the sum of the manual working hours multiplied by the comprehensive width ratio, the pick-and-place time of the mobile phone on the product production line and the pick-and-place time of the mobile phone under the product production line.

Preferably, the mobile phone assembly workshop production line simulation system further comprises a design scheme optimization module, wherein the design scheme optimization module is used for establishing a simulation model according to the design scheme through simulation software and carrying out operation simulation on the mobile phone assembly workshop production line according to the simulation model to obtain the per-hour simulation yield; the simulation system is also used for optimizing the design scheme when the hourly simulation yield is smaller than the hourly target capacity after simulation operation, reestablishing a simulation model for the optimized design scheme, and then performing operation simulation on a production line of the mobile phone assembly workshop according to the simulation model; the system is also used for analyzing the working time proportion of each station, increasing the number of devices for the station endowed with the automatic possibility label with the working time proportion of more than 80 percent, increasing the number of devices or workers for the station endowed with the semi-automatic possibility label with the working time proportion of more than 80 percent, and increasing the number of workers for the station endowed with the automatic possibility label with the zero automation with the working time proportion of more than 80 percent; and outputting the design scheme as a final design scheme when the hourly simulation output is greater than or equal to the hourly target capacity after the simulation is run.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A design method of a production line of a mobile phone assembly workshop is characterized by comprising the following steps:

the process flow analysis step comprises:

a1: acquiring all working procedures in the mobile phone assembly process flow;

and (3) automatic analysis of stations in the assembly process:

a workshop production line forming step:

2. The design method of the production line of the mobile phone assembly plant according to claim 1, wherein: the heuristic balancing algorithm in the step B1 is specifically: according to the beat requirement of a production line, distributing to a first station from a first procedure, and after the distribution of the first station is completed, distributing to subsequent stations until all procedures are distributed;

3. The design method of the mobile phone assembly plant production line according to claim 2, wherein: the step B2 further includes analyzing the possibility of each station automation operation according to the assembly process factors and detection process factors in the stations, and classifying the stations, wherein the assembly process factors include assembly part characteristics, assembly space, assembly precision, assembly plane and position characteristics, and the detection process factors include detection mode and detection conditions.

4. The design method of the mobile phone assembly plant production line according to claim 3, wherein: the step C2 specifically includes: the time of day of a workstation assigned an automated automation possibility label is equal to the equipment time of the equipment executing the workstation;

5. The design method of the mobile phone assembly plant production line according to claim 4, wherein: the method also comprises a design scheme optimization step after the workshop production line forming step, wherein the design scheme optimization step is as follows:

6. The utility model provides a design system of line is produced in cell-phone assembly shop which characterized in that: the system comprises a process flow analysis module, an assembly procedure station automation analysis module and a workshop production line forming module;

7. The design system of the mobile phone assembly plant production line of claim 6, wherein: the heuristic balance algorithm of the assembly procedure station automation analysis module is specifically used for distributing the first procedure to the first station from the first procedure according to the production line beat requirement, and then distributing the subsequent stations after the distribution of the first station is completed until all procedures are distributed; and the system is also used for complementing the next procedure when redundant time exists after the corresponding procedure is distributed to the stations, wherein when the next procedure is complemented, the next procedure is selected through the constraint property among the procedures.

8. The design system of the mobile phone assembly plant production line of claim 7, wherein: the assembly process station automation analysis module is also used for analyzing the possibility of each station automation operation according to assembly process factors and detection process factors in the stations, and classifying the stations, wherein the assembly process factors comprise assembly part characteristics, assembly space, assembly precision, assembly plane and position characteristics, and the detection process factors comprise detection modes and detection conditions.

9. The design system of the mobile phone assembly plant production line of claim 8, wherein: when the workshop production line forming module is used for calculating the working hours of each station according to the automation possibility label, the working hours of the station endowed with the automation possibility label are equal to the equipment working hours of equipment for executing the station, and the working hours of the station endowed with the semi-automation possibility label are equal to the equipment working hours, the manual working hours and the working hours of the station endowed with the automation possibility label with zero automation of the sum of the working hours of the operation correction of workers are equal to the working hours of the manual work and the working hours of the operation correction of workers; and the worker operation correction working hours are the sum of the manual working hours multiplied by the comprehensive width ratio, the pick-and-place time of the mobile phone on the product production line and the pick-and-place time of the mobile phone under the product production line.

10. The design system of the mobile phone assembly plant production line of claim 9, wherein: the design scheme optimization module is used for establishing a simulation model according to the design scheme through simulation software and performing operation simulation on a production line of the mobile phone assembly workshop according to the simulation model to obtain the per-hour simulation yield; the simulation system is also used for optimizing the design scheme when the hourly simulation yield is smaller than the hourly target capacity after simulation operation, reestablishing a simulation model for the optimized design scheme, and then performing operation simulation on a production line of the mobile phone assembly workshop according to the simulation model; the system is also used for analyzing the working time proportion of each station, increasing the number of devices for the station endowed with the automatic possibility label with the working time proportion of more than 80 percent, increasing the number of devices or workers for the station endowed with the semi-automatic possibility label with the working time proportion of more than 80 percent, and increasing the number of workers for the station endowed with the automatic possibility label with the zero automation with the working time proportion of more than 80 percent; and outputting the design scheme as a final design scheme when the hourly simulation output is greater than or equal to the hourly target capacity after the simulation is run.