The establishment of product structure is the key to the success or failure of the implementation of ERP production system
ERP enterprise resource planning is an enterprise-level management software that involves all aspects of enterprise management. As a management system, the implementation considerations are not only the management ideas contained in the software itself, but also the inherent characteristics of the enterprise. Generally, companies adopt overall planning and step-by-step implementation strategies when implementing ERP, and most of them start with purchase, sale and inventory. Relatively speaking, purchase, sale and inventory are easier to implement and easier to see the effect. Sub-systems. Manufacturing system is the difficulty of ERP enterprise resource planning and it is also the core part of ERP. Through the production and manufacturing system, the company’s sales, purchase, inventory, cost and other management processes can be organically integrated. Software that has no plan or sufficient planning model can be called enterprise management software, enterprise process integration software, and can be called anything other than ERP, but it is not ERP, because we know that ERP is based on planning.
The ERP system selects the corresponding parameters based on various basic information such as sales orders, sales forecasts, finished product inventory, lead time, etc., and calculates the feasible production plan in the corresponding period; the calculation results of MPS are passed to MRP and other related plans as basic data. More importantly, ERP transfers it as a production order to the corresponding production department to perform the production task; in the process of the production department executing the production task, ERP compares the plan data with the execution result, checks the execution effect of the plan and discovers the problem in time; The results of the inspection, the experience and lessons discovered are summarized in the planning model by revising the calculation parameters and revising the workflow.
This is the planning system of the ERP system. The implementation of the manufacturing system is a difficult point in the implementation of ERP, and it is also an important link between the previous and the next. To implement the manufacturing system well, the following tasks must be done:
1. The establishment of the product structure tree is the key to the success or failure of the implementation of the ERP production subsystem
To adopt computer-aided enterprise production management, the computer must first be able to read out the product composition manufactured by the enterprise and all the materials to be involved. In order to facilitate the computer recognition, the product structure expressed in icons must be transformed into a certain data format. The file that describes the product structure in a data format is the bill of materials, that is, the BOM. It is a technical document that defines the product structure. Therefore, it is also called a product structure table or a product structure tree. BOM (Bill of Materials) is the most critical unit of the ERP system. It determines the success or failure of the manufacturing system and is also the most important basis for product quotation. Therefore, companies must first establish a product structure tree before implementing the ERP manufacturing system.
There are two ways to establish a product structure tree. One is that the company has implemented the PDM system first, established the design structure tree in the PDM, and then transmits the product structure information and product material information to the ERP through the integrated manufacturing interface of PDM and ERP. , And transformed into the required engineering structure tree in ERP through process parameter definition. The other way is that the company does not implement the PDM system, and directly defines the material information in the ERP system, establishes the engineering structure tree, and defines the relevant process parameters to form the engineering structure tree required by the ERP. Since our company has implemented the PDM system before the implementation of the ERP system, our company is the first method adopted. Through comparison, I personally think that the first way is a more advantageous way to build a product structure tree. Many companies did not implement the PDM system when implementing the ERP system, but after the implementation of the ERP system, they would choose to continue to implement the PDM system, because the PDM system is the data source of the ERP system, and it is out of the support of the PDM system and the materials required by the ERP system. Data, especially product structure information, cannot be effectively generated or cannot be easily generated.
1.1 The establishment of design BOM is the foundation
Design BOM is a design product structure tree established by engineering designers in the PDM system according to product requirements. In this structure tree, there are basic information about product materials, product structure level information, product quota information and some products. Process information. Of course, the least of this information is coding, which is the most basic work for preparing engineering data before implementing the ERP system. For discrete manufacturing companies, there are many varieties of products, multiple varieties in small batches, multiple varieties in large batches, hundreds of series, and thousands of specifications. Establishing a product design BOM is a complex and tedious task. If you want to build all the structure trees all at once, there are many difficulties. Our company still adopts a step-by-step strategy when establishing a design structure tree, building a product structure tree according to product series. First establish the most basic product basic series, and then complete a product structure tree of other series in each time period, so that the establishment of the design BOM is completed step by step. Through the analysis of the company’s product structure, I feel that most of the company’s products are derived from the standard basic series. The difference from the standard basic series products is generally only about 5%-10%, while the remaining 90% Around% is exactly the same. Therefore, by first establishing the standard basic series product structure tree, and then shortening the establishment process, this does not lose a good establishment method.
1.2 Engineering BOM conversion is the key to production plan operation
Engineering BOM is designed by process engineers according to the processing level and ability of the factory. It is used for process design and production management. It can be used to clearly understand the manufacturing relationship between parts and parts, and track how the parts are manufactured, where they are manufactured, who is manufactured, and what they are manufactured with. At the same time, engineering BOM is also one of the key management data structures of MRPⅡ/ERP production management.
provides a basic material definition interface in the software, which can conveniently define basic material information, warehouse information, financial cost information, and production plan information. In addition, ERP provides interface table data transmission, including material data transmission, product structure information transmission, and process route information transmission. Through the interface, product structure information, material information, and process information in PDM can be transmitted to the ERP system. Such an engineering BOM that can be used by ERP is established.
1.3 Four Steps to Determine BOM
Under normal circumstances, to determine a final correct BOM, four steps are required: the first step is to establish a design BOM; the second step is to transform the project BOM; the third step is to verify the operation plan; and the fourth step is to carry out feedback problems. correct. It takes four steps to finally determine the accurate and complete product BOM. This process is generally impossible to omit, especially the verification phase, through which the integrity of the BOM structure information, the accuracy of the quota and lead time, and the correctness of the process route setting can be verified. These parameters can only be finally verified and fed back through the actual planned operation and the specific application of the actual manufacturing process.
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