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The question.
To do a good job of production line job management, first of all must realize that the production line job management is not just a human resources department, all managers, each supervisor and even employees should bear the responsibility of job management, and emphasize that business managers should be job management experts.
Job management, should start from the selection, training, employment and retention of several aspects, and gradually establish a perfect job management system.
The first focus on internal training. Enterprises have two ways to get talent: external excavation and internal training. The advantage of external excavation is to ensure that enterprises can obtain the required talent in a timely manner, to bring vitality to the enterprise relatively high cost. The advantage of internal training is that it has a certain incentive effect on the staff, and the trained and promoted staff are more familiar with the enterprise, and the management cost is relatively low. Only focus on strengthening the learning and research in this area, can really the lowest cost and the most feasible way for the talent pool of the enterprise to continue to input fresh blood.
Secondly, we should pay attention to emotional management. Emotional management is the main content of cultural management, is an important affinity project. Emotional management focuses on the inner world of employees, the core of which is to stimulate the positive feelings of workers, eliminate the negative emotions of workers, through the two-way exchange of emotions and communication to achieve effective management, from the depths of the heart to stimulate the inner potential of each employee, initiative and the spirit of creativity, so that they can really do to be in a good mood, sparing no effort to open up for the enterprise to develop new excellent performance.
Chapter 4 SMT production line process optimization
4.1 PCB printing process control
SMT production technology in all aspects of the product performance have a direct impact on the quality of the printing control is one of the very critical aspects. Its control directly affects the quality of the assembled board. For example:
Solder paste: solder paste activity can be determined according to the degree of PCB surface cleanliness, the general use of RMA level, if necessary, the use of RA level: according to different coating methods to choose a different viscosity of the solder paste; fine-pitch printing of the choice of spherical fine particles of solder paste; double-sided soldering, the first side of the use of high-melting-point paste, the second side of the low-melting-point paste, to ensure that the two are separated by 30-40 ℃! To prevent the first side has been soldered components off ......
Template: template is too thick will lead to poor release of solder paste, and easy to cause the solder joints bridge; too thin, it is difficult to meet the requirements of coarse and fine pitch mixing of assembly boards......
In addition to these can be controlled by the characteristics of the paste, template design and manufacturing control, as well as the optimization of the printing equipment process parameters can play a better effect on the control of the quality of solder paste printing
4.2 Component mounting process control
Component mounting control is a non-negligible part of the production control of the SMT, the first to ensure that the quality of the mounting of the three elements: a component Correct; b bit accurate; c pressure (patch height) appropriate.
Component placement process control can start from the following aspects:
1. Programming optimization, such as the optimization principle for the minimum number of times to change the suction nozzle; pickup, patch path shortest; multi-head mounting machine should also be considered each time to pick up the number of pieces of the largest number of simultaneous;
2. Make MARK and component images;
3. Mounting pre-preparation;
4. Safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection, safety inspection and safety inspection.
4. Safety check, safety operation;
5. Feeder use;
6. Operation specification;
7. First piece confirmation and other links
In addition to these aspects of the above some special processes can also be achieved for the purpose of placement control, such as local Mark point of the setup can be to ensure that the quality of the placement. Mounter process control requires extensive operating experience and research spirit, which is a long-term practice process.
4.3 reflow soldering process control
Reflow soldering process control is also an important process of SMT process control, regardless of what we use the soldering technology, should ensure that to meet the basic requirements of the soldering, so as to ensure that there is a good welding results. High-quality soldering should have the following five basic requirements:
1. appropriate heat;
2. good wetting;
3. appropriate size and shape of the weld joint;
4. controlled direction of the tin flow;
5. soldering process, the soldering surface does not move.
In the reflow soldering process, in addition to the above general soldering conditions, there is a special point, it is necessary to go through the printing process does not have the role of the solder paste in the chemical composition of the timely evaporation process.
Reflow soldering is in fact a set of processes including heating, constant temperature, fluxing, soldering, and cooling five processes. If this important link is ignored, for us to solve process problems may cause confusion or wrong decision.
To ensure a good reflow soldering process, there should be the following practices:
1. Understand the quality of your PCBA and soldering requirements, such as the highest temperature requirements and the most important need to be taken care of in the life of the soldering joints and devices;
2. Understanding of PCBA soldering on the difficult, such as solder paste printing is larger than the pads of the part, the spacing of the part of the exceptionally small, etc.;< /p>
3.
3. Find out the PCBA on the hottest and coldest point, and in the point of welding temperature measurement of the thermal coupling;
4. Decide that the other must be connected to the thermal coupling of the temperature measurement of the place, for example, the BGA package and the bottom of the solder joints, heat-sensitive devices, etc.;
5. Set up the initial parameters, and process specifications for comparison and adjustments;
6. The soldered PCB in the Microscope for careful observation, observe the shape of the solder joints and surface conditions, degree of wetting, tin flow direction, residues and solder balls on the PCBA and so on. For failure mode analysis, and then for its mechanism with the upper and lower temperature zone control for adjustment. The purpose is to make the setup process the most stable and least risky. When adjusting, the furnace load problem and the production line speed problem are also taken into consideration, so as to get a better balance between quality and yield.
Chapter 5 SMT production line system maintenance
5.1 SMT-related equipment maintenance
Equipment is one of the three elements of productivity, is the material means of social production. Equipment management is good or bad, the number of products for the enterprise, quality and cost and other economic and technical indicators, have a decisive impact, so we must strictly in accordance with the laws of operation of the equipment, grasp the correct use of equipment, careful maintenance, scientific maintenance, and strive to improve the rate of equipment intact to ensure the smooth progress of production.
First of all, operators and maintenance (inspection) repair personnel should raise awareness, correct attitude, to achieve the correct use, careful maintenance, with a serious attitude and scientific methods to maintain good SMT-related equipment. Adhere to the principle that maintenance and overhaul should be given equal importance. Strictly implement the job responsibility system to ensure that the performance of the equipment in use is in a better state.
Secondly, the operator of the equipment used to achieve "four understand, three will" (understand the structure, understand the performance, understand the use; full use, maintenance, troubleshooting), and enjoy the "three rights", that is: the right to stop others from privately using the equipment they operate; failure to take precautions to prevent the use of the equipment. The right to stop others from privately using the equipment they operate; the right to stop using the equipment without taking precautions or overloading the equipment without the approval of the main customer department; the right to stop using the equipment; and the right to report any irregularities in the operation of the equipment, failure to overhaul over the period of time, or failure of the safety devices to comply with the regulations.
Operators again, must do the following main tasks:
1. Correct use of equipment, strict compliance with operating procedures, start before the start of serious preparations, start in the repeated checks,
use the process of standardized operation.
2. Careful maintenance, strict implementation of the inspection system, the use of "five-word operation method" (listening, rubbing, smelling, watching,
than).
3. Fill in the equipment operation record, defect record, and operation diary.
4. Often keep the equipment and the environment clean and hygienic, so that the ditch to see the bottom, the shaft to see the light, the equipment to see the color, the door
window glass net.
5. Improve equipment lubrication. Strictly implement the equipment lubrication management system, adhere to the "five" principle (five:
fixed-point, fixed-time, fixed-quality, fixed-quantity, fixed-person)
5.2 SMT system maintenance design
System maintenance in order to improve the enterprise's production capacity and production efficiency, refers to both the installation of the equipment system Equipment-related inspection, use of planning,, manufacturing control, operation and maintenance, repair and maintenance, system modification, modification until the end of the whole process of engineering and technical maintenance. Equipment from installation to end-of-life need to carry out comprehensive, scientific maintenance management, in order to let it play the maximum value of use. There may be inherent design deficiencies in the equipment system, but the equipment system of the acquired system maintenance can be done to make up for the shortcomings of the effect. Equipment system maintenance is the equipment of the whole process of management in the longest duration, the content of the extremely heavy management.
The maintenance of equipment is the most important part of the system maintenance. Equipment maintenance is divided into two levels, one is the daily maintenance of equipment, the second is the regular maintenance of equipment.
Chapter 6 Comprehensive Management of SMT Production Line
6.1 SMT Production Line Capacity Control
For the improvement of SET production line capacity efficiency, scientific management and advanced production concepts are very worthy of our attention.SMT production line to achieve the maximum output, it is necessary to take into account the efficiency of the production line. Mounter is the key equipment in SMT production line, so it is very important to improve the production efficiency of the mounter. The following is an example of optimized placement to analyze the capacity optimization of the SMT production line.
Usually an SMT production line mounter link by a high-speed mounter and a high-precision multi-function mounter, when the two mounter production time is equal and the smallest, the entire production line to play the maximum capacity. This ideal state is affected by many factors. Our goal is to use manual intervention as much as possible to rationally distribute components and achieve a balance between the two machines. For example:
1. Try not to assign degraded components to high-speed machines, so that a few components don't lead to
an overall degradation that affects productivity.
2. Distribute components according to the type of components that can be mounted on each mounter.
3. Try not to change nozzles and change as few nozzles as possible.
4. The Feeder with more components is closest to the PCB and reduces nozzle travel.
5. Try to realize simultaneous suction, shorten the suction time, improve productivity.
6. Optimize the identification of components to improve the efficiency of component identification.
7. Try to realize full load in each cycle to reduce the number of pickups.
8. In a cycle, try to pick up material only from the front or back of the station to reduce the head
movement distance.
In addition to the appeal of the SMT production line capacity optimization will be affected by many other aspects of the following factors affecting the efficiency of the capacity:
Improve the efficiency of the SMT production line capacity not only need to be reasonable use of equipment, optimization programs also need to implement strict and effective management measures, good equipment monitoring and maintenance, and need to accumulate experience in the SMT capacity optimization. Optimization of more efforts. If the management and use of the law, and pay attention to the above mentioned aspects of serious analysis, fully tap the production potential of the SMT production line to improve production efficiency is still a chapter to follow.
6.1 SMT production line dynamic management
SMT is a systematic project, which involves components and their packaging and taping form, PCB, materials and auxiliary materials, design, manufacturing technology and production process, equipment and spare parts, tooling, testing and management of a variety of elements, is a comprehensive production technology, favoring a certain link or several links, can not be realized in the true sense of good operation. The company's products and services are designed to meet the needs of the market and to meet the needs of the customers.