SMT feeding error prevention has always been a problem that plagues many enterprises, so how to use the LEAN MES system to achieve this goal? Before the SMT equipment is patched, the operator needs to put the material tray on the correct feeder, and then put the feeder on the appropriate SMT equipment station. In this process, the wrong material or the wrong feeder is often used. , Since the SMT equipment runs continuously at high speed, if this error cannot be avoided in advance, it will cause rework or scrapping, which will bring huge losses to the enterprise. To avoid this, the best way is to The corresponding relationship between the feeding tray, the Feeder used, and the station to be loaded is compared with the feeding station table.
To achieve the purpose of comparison, it is first necessary to establish the basic data of the material station table in the LEAN MES system. A complete material station table data basically includes product code (or work order code), material code, Feeder specification, production line code, equipment number, station number, and for double panels, it also includes board information (A/B surface), and a table number is required for a dual-table device. The material station table data is generally maintained by the craftsman, and is entered into the computer connected to the SMT equipment in advance. Before the material loading comparison, it is only necessary to import this data from the computer of the SMT equipment into the MES system.
Speaking of which, you may consider another question, that is, what should you do if the data of the material station table itself is wrong? In the electronic assembly industry, a product consists of hundreds or thousands of electronic components, and these electronic components have many substitute materials or designated materials. In order to reduce costs and maximize the use of inventory surplus materials, there may be frequent changes in the production process. To change the materials, naturally, it is necessary to change the material station table frequently. Considering this situation, it is necessary to reduce the possibility of errors in the data of the material station table as much as possible. There are generally two processing methods to achieve this purpose:
First, after changing the material station table, the system forces the user to compare the materials contained in the material station table of the product with the material issue list of the current work order. Continuation is only allowed if the comparison results are consistent or the user approves the difference. use the material station table;
Second, the material station table data entering the LEAN MES system itself is composed of two parts, one part is the batching BOM of the work order (including the material code, Symbol number), and the other part is the process BOM data prepared by the craftsman. The BOM data does not contain specific material information, but only gives the station location and Feeder specification information of a certain SMT device corresponding to each Symbol. The process BOM data is basically fixed for each model, and the only thing that changes is the work order batching BOM data, and the work order batching BOM data is often generated and adjusted in the ERP system, and the possibility of errors is extremely small.
After having the material station table data, it is necessary to consider how to realize error proofing during the feeding scanning process. To put it simply, feeding error prevention means that the system compares the material labels, Feeder labels, station labels scanned by the user during the feeding process and the material station table data, and gives clear warning messages when inconsistencies are found, so as to achieve inspection. and warning purposes. The seemingly simple SMT feeding operation has its own complexity. A complete and practical SMT feeding error prevention system needs to provide at least the following functions:
First, in the entire production process of the SMT workshop, the feeding scanning can be attributed to four business types: feeding, changing/receiving, unloading, and QC sampling comparison. System functions of various business types, and special consideration should be given to the user's work habits to minimize the complexity of user operations;
Second, many electronic products produced by customers involve single-sided, double-sided, and mixed panels containing various products. The loading error-proofing system must be able to support various complex product structures and maintain business with customers to the greatest extent possible. habit in harmony;
Third, the feeding error prevention system needs to collect the various label information scanned by the operator before it can compare the data of the material station table. It is possible to reduce the complexity of system operation and reduce the resistance of front-line personnel to the system.
For more detailed information on the MES system, please call Shen Kete at 400-660-3889
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