Application of manufacturing execution system most

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The application of manufacturing execution system adapted to BPR in aviation enterprises

as most of the production management of aviation enterprises must be carried out in the workshop, the drawbacks of traditional management theory and the black hole of information technology have seriously hindered the survival and development of aviation enterprises. The traditional production site management is only a black box operation, which can no longer meet the needs of competition, and the manufacturing execution system (MES) can just fill this gap. The implementation of MES at the workshop level helps aviation enterprises to integrate with practice, avoid the information technology black hole, and guide enterprises to comprehensively utilize various advanced manufacturing ideas and management technologies to overcome the disadvantages of traditional management theories. The implementation of business process reengineering (BPR) based on MES points out an idea and direction for aviation enterprises

1 application principle of implementing BPR based on MES

business process is a series of interconnected activities for enterprises to create value for customers. With the continuous changes of market environment, enterprise scale and business environment, the business process system of aviation enterprises is more complex, and there are more and more collaborative interactions between business departments. In order to maintain the agility and smoothness of business process information inside and outside the enterprise, and improve the competitive advantage of enterprise supply chain management. The reform of business process, information process and organizational structure is inevitable

bpr is a revolutionary method to significantly improve business process performance by using information technology and human resource management. Information technology is an integral part of BPR. The supporting effect of information technology on BPR is mainly reflected in three aspects: (1) realizing information flow tracking material flow; (2) Realize information flow to drive capital flow and material flow, and the integration of three flows; (3) The workflow of information system replaces the transaction flow

mes is a workshop oriented management information system between the plan management system at the upper level of the enterprise and the industrial control at the lower level. MES can optimize the management of the entire business process from the issuance of production orders to the completion of products through the transmission of information. The rapid response to status changes enables MES to reduce non value-added links in the internal process of the enterprise and effectively guide the production and operation process of the factory, which meets the core requirements of BPR

workflow is a computerized representation model of business process, which defines various parameters required to complete the whole process. These parameters include the definition of each step in the process, the execution sequence and conditions between steps. The establishment of data flow, who is responsible for each step, and the application required by each activity. Workflow management is a technical junction between business process management and manufacturing execution system. BPR needs the system support of workflow management technology to meet the needs of business process automation. MES has the flexibility of openness, self-organization, adaptation and reconfiguration, and can support the definition, control, execution and management of workflow

use BPR to analyze and reconstruct the enterprise business process, define and model the reconstructed business process in MES, specify the execution role of process activities through MES workflow management function, allocate the resources to execute process task activities, and finally realize the automatic execution of enterprise business processes, so as to achieve the goal of improving the management level of aviation enterprises and enhancing the competitiveness of aviation enterprises

2 the implementation process of adapting MES to BPR

the application of the system should go through three steps: analyzing business processes, defining workflow models and implementing models. The following describes the main process of analysis and design in combination with the MES of the composite production workshop of a large aviation manufacturing enterprise

2.1 business modeling and requirements analysis of the system

the purpose of business model and requirements analysis is to evaluate, collect and analyze the requirements of the system, and the focus is to fully consider the practicality of the system. The analysis results can be represented by a business use case block diagram. The use case diagram does not include complex processing process, but simply shows the functions to be realized by the system and gives the outline of the system

the flexibility of the system should be considered from the initial stage. First of all, it is necessary to understand the business process and decompose it into relatively independent modules, that is, to realize the low coupling of modules. Secondly, the calling relationship between modules should be separated from the specific business. In this way, the business process can be changed only by modifying the conditions of mutual calls between businesses without modifying the business processing module. This method is more flexible than the method of rewriting specific task modules. In this process, the modularization of business activities is the key. After investigation, the whole system can be divided into the following 13 modules:

(1) system management module: it provides settings for the basic parameters and interfaces of the system

(2) authority management module: provides the design and control of system access authority

(3) workflow management module: used to design and control all workflow models involved in the system

(4) department personnel management module: provides management and maintenance of workshop personnel organization structure information

(5) document management module: provides the management of all design, process, manufacturing, finance and other document information in the workshop

(6) equipment management module: provides the status query function for all production equipment information in the workshop

(7) warehouse management module: it provides the maintenance of the inventory information of the four warehouses in the workshop, as well as the control and recording of the warehouse in and warehouse out information

(8) production plan module: assist the workshop planner to decompose the main production plan and prepare a detailed monthly production plan

(9) production scheduling module: assist the workshop dispatcher to decompose the monthly production plan and prepare the production order by computer

(10) order management module: assist workshop technicians and dispatchers to control and maintain the prepared production order

(11) production tracking module: conduct real-time monitoring and Kanban management on the production site

(12) quality management module: timely analyze and feed back product quality parameters

(13) internal mail module: provides internal communication function of workshop

2.2 define workflow model for each business activity

process modeling is an important foundation of BPR, and workflow model is a form of process model. Considering that the job flow in the workshop is composed of business nodes, the system chooses the activity-based method for modeling

in each workflow model, the organization model provides the personnel information support of each activity node, the resource model provides the resource information support such as materials and equipment required by the node, and the process model describes each process of workshop work, which is composed of activity nodes according to certain logical relationships. For each node, it generally includes the executor, required equipment, trigger application, input and output and other related support contents. Thus, the job flow of the whole workshop is mapped into a structural model, as shown in Figure 1. They together constitute a user oriented data view

Figure 1 workflow model architecture

take the distribution process of production orders as an example. When the orders are distributed from the planning and scheduling room to the workshop team, the current activity node stays in the team phase. On this node, information such as the order content, distribution date, completion date, team number, and team leader name are stored. When the team leader receives the information on the display terminal in his/her work place, he/she can carry out the relevant signing operation. After the receipt is completed. The status of this activity node is set to "completed". At the same time, the next node is activated, and the related organization and resource information stored on the next node is called out. Based on this information, the executor of the next node and the operations to be performed are found until the whole process is completed

2.3 specific implementation of workflow management

for the specific implementation of workflow management, consider adopting the method shown in Figure 2. First, define a data table to store the information of all workflow models in the advanced electric furnace enterprise. Each record of the table corresponds to an XML file. Each element of the file defines the node description, execution conditions, completion conditions and other information of the workflow model. Whenever a workshop executes a workflow, it generates a workflow instance by reading the workflow model information table and the model definition file, and correspondingly generates a new XML file describing the instance. The instance file inherits all the element information in the model definition file, finds out how we can better implement it, and dynamically fills in the relevant data in each element during the instantiation process, Workflow instances are also stored in a workflow instance information table in the form of a single record. In this way, when the workflow instance file is generated. Each element of it corresponds to each specific activity node in the workshop workflow, and the content and operation of each activity node are reflected through different objects of the information system. All these objects combine to form the information system workflow that reflects the job shop

Figure 2 Definition and storage model of workflow

3 application example

3.1 MES application example adapted to BPR

a large aviation manufacturing enterprise decided to reorganize the business process of its composite component production workshop according to the market demand and the production and operation status of the enterprise. It adopted various advanced management technologies and combined with the implementation of MES to open up the information flow and establish the first digital production line of composite components in China

through investigation and analysis, it is found that the implementation of the company's business processes is still mainly manual, the workshop operation system is not flexible enough, and the product data sources are not unified. There are many problems such as "islands" of information. Based on this analysis result, the project team has re planned and designed the entire business process system and organizational structure of the workshop, and proposed the physical implementation environment of MES adapted to BPR, as shown in Figure 3

3.2 application example of digital business process

in the process of introducing BPR, the project team combined the actual situation of the existing work process with the implementation of MES, and adopted the "ESIA method", that is, eliminate, simplify, integrate (in according to the different grades that impact the actual situation) and automate. The process optimization was realized in the following aspects: (1) decomposing the master plan by computer and preparing the plan, Simplify the previous tedious steps, and improve the efficiency and quality of planning; (2) The electronic countersignature cancels the blue drying in the reference room, greatly shortening the production preparation cycle; (3) The establishment of interfaces with enterprise CAPP and enterprise ERP ensures the single data source, reduces redundancy, avoids sensor damage, and improves statistical efficiency; (4) Through the capability matching of equipment and material information. The dynamic management of production is realized; (5) Through the control and maintenance of bar code tracking data, the Kanban management on the production site is realized

Figure 4 shows the business process after workshop reorganization. Compared with the process implementation before the reorganization, the production preparation cycle after the reorganization has been shortened by 15 working days, the efficiency has been improved by about 50%, the data input time has been reduced by more than 75%, and the losses caused by paper work and design blueprint have been reduced by 56%, realizing the goal of process reorganization

Figure 4 business process of composite production workshop of aviation manufacturing enterprise after reorganization

4 conclusion

backward production and manufacturing management is an urgent problem for aviation enterprises at this stage.

Copyright © 2011 JIN SHI