PCBA Tech - ​Informationization of the execution process of SMT workshop

The informatization construction of the SMT workshop needs to mine the information and data that can improve the production level and management ability in the implementation and present it in front of the employees of the company for decision-making in an orderly manner, and can automatically intervene in the production process in a program. The implementation of the main needs to achieve the following management effects:

1. Transparent management of the production site.

2. Real-time control of the distribution status of products in progress.

3. Trace and track all links of the production site.

4. Prevent wrong material, wrong operation and wrong flow direction during product processing.

5. Provide real-time and accurate production unit production performance analysis report.

6. Automatically collect all kinds of on-site data to reduce the cost of manpower collection.

7. Can provide enterprise customers with reports that prove the level of process management.

8. Supervise the operation status of each equipment in the SMT workshop, and provide various equipment management reports.

First of all, the first process is the suction plate, which can also be regarded as feeding. The function of the board suction machine is to suck the PCB board and send it to the production line conveyor belt. From the perspective of execution, the information flow that passes through is mainly feed information, such as which boards have been voted, and when and who will perform the boarding action. Of course, these PCB boards also carry a lot of information, which can also be said to be the attributes of the PCB boards, which generally include the board number, model, supplier, and manufacturing order/work order.

The manufacturing order/work order is a very important information flow in the execution of the entire workshop, and it is also the main body of a lot of information that needs to be attached or stored, such as the process route, inspection items of each process/process, production line, key parts, BOM, equipment parameters And so on many execution parameters. Of course, for the manufacturing execution system, it is not that the more execution parameters, the better, sometimes too many execution parameters will restrict the production speed to a certain extent, which requires specific analysis. For example, you can manage the speed of the suction plate, and the manufacturing execution system will intervene when the speed is not in place. But generally speaking, the execution information of the suction plate only needs to be concerned with the amount of feeding, time and plate number.

Solder paste printing, in short, is to apply the solder paste to the corresponding position on the PCB board. It is the first process/process after the PCB board is sent to the conveyor belt, and it is also the first process/process that actually starts processing. . The materials and tools required for solder paste printing include solder paste, steel plate, scraper, wiper paper, dust-free paper, cleaning agent, stirring knife, etc. These materials and tools have their own strict implementation standards and standards during the production process. . Such as solder paste: Is the refrigeration of solder paste controlled on a first-in first-out basis? Is the refrigeration temperature of solder paste within the range recommended by the manufacturer? Do you check that the temperature recorded in the refrigerator is within the specified storage temperature limit? Are there documents and records for the expiration date and time of solder paste opened at ambient temperature? Are there documents and records for the expiration date and time of unopened solder paste at ambient temperature? Is there evidence that the operator correctly completed the information and fully understood the entire process? Is the maximum allowable time for solder paste to stay on the board before reflow is documented, and is it understood and implemented? Is the lot number of the solder paste recorded? Can the serial number of a single product be traced completely and easily? Wait for a series of solder paste implementation regulations. Obviously, whether these execution standards need to be fully integrated into the information flow of the manufacturing execution system, and how to make the system information have a positive effect on the use of solder paste are all issues that information builders and enterprises need to discuss together. Generally speaking, solder paste The information of opening time, refrigerating time and temperature will have obvious benefits to the operator. In addition to the information about materials and tools, the entire solder paste printing process/process also has quality information such as its own printing operator, time and board number, and solder paste thickness after printing.

The component patch, its function is to accurately install the surface mount components to the fixed position of the PCB. This is the core process/procedure of the SMT process, and it is also the link most prone to quality problems. The materials and tools that need to be prepared mainly include: materials, feeding systems, and placement machines. At present, most of the materials exist in the form of reel. A reel is formed by winding the reel. Each reel is also the smallest packaging unit through which the material can be traced. The material is loaded into the feeding system (such as Feida), and the suction nozzle of the placement machine absorbs the components from the feeding system, and then aligns the PCB to the corresponding position for placement. The main points of the implementation of component placement are: first, the component cannot be wrong, second, the placement position cannot be wrong, and third, minimize the downtime and discard the material.

Visual inspection and AOI, AOI (Automatic Optical Inspection) is the abbreviation of automatic optical inspection, the name of the equipment used is AOI equipment, and the main function is to automatically inspect the quality of the PCB board through the optical principle. The price of AOI equipment requires tens of millions of RMB. Therefore, AOI equipment that cannot generate added value and is expensive is not available in all SMT workshops, and not every line is equipped with it. Each line is equipped with more Mostly it is a visual inspection. Here, the author only uses AOI equipment to describe how quality information plays its own role in the manufacturing execution system. Quality as the life of a brand or even a company should not be sloppy. Quality information is unquestioned when it enters the manufacturing execution system. The main disadvantages of SMT process are: throwing, missing parts, displacement, short circuit, virtual welding, reverse white, upright, tin bead, etc. Defects will have reasons, and they will also correspond to corresponding quality inspection items. Before manufacturing execution, most companies report quality data once a day. After quality data is sorted by quality personnel, they can draw control charts and calculate Cpk. However, when the process is found to be abnormal, they can no longer intervene... It needs to perform inspections. The information generated in the process is collected in real time to generate immediate benefits for management. AOI equipment needs to be connected with the manufacturing execution system to achieve real-time and accurate integration of information, and most of the current methods of visual inspection are to make bad information into a bar code and print it on a list. The visual inspector scans the board number during inspection and finds If it is bad, scan its corresponding bad information barcode. The system immediately reflects this data on various quality management charts, and the quality department takes corresponding measures based on the real-time charts. Quality inspection information generally includes: board number, time, inspector, defective items, defective quantity, etc.

Maintenance, unlike most industries, SMT maintenance is a sophisticated skill that requires maintenance equipment and maintenance personnel of the corresponding level or qualification. For the manufacturing execution system, the specific implementation process of maintenance may not be able to intervene, but the knowledge accumulation of maintenance methods, the review of maintenance qualifications, the tracking of maintenance replacement components, the statistics of maintenance performance, and the entrance to the maintenance return process cannot be slackened. Task.

Of course, the above is not all the execution information of the SMT workshop. Maybe you think that the work instructions need to be displayed in front of the operator in real time. Maybe your company's packaging and shipping execution process needs more control, or maybe you are working on heavy industry and RMA processes. It hurts my brain, wait. How to control and manage the execution information of the SMT workshop, I think we need our information workers to continuously go deep into the front line and go deep into the scene, truly thinking from the customer's standpoint, so that information technology can better serve the enterprise management.