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How to improve SMT patch quality and efficiency?
Time:2021-10-08 Read: 360

The placement machine must not only be fast, but also be accurate and stable. In the actual operation process, each placement machine mounts electronic components with different specifications and speeds. For example, the accuracy of LED components is relatively low relative to the accuracy requirements of SMT components, so the speed of LED products is faster than SMT products, because the precision requirements of SMT are higher than that of LEDs. The processing speed in domestic placement is slower, and the placement efficiency is naturally reduced.


On the one hand, the suction nozzle of the placement machine has insufficient vacuum negative pressure. Before the suction nozzle picks up the parts, the mechanical valve on the placement head is automatically converted. When the sensor detection value is within a certain range, the machine is normal, otherwise the suction is bad. On the one hand, it is the pressure relief of the air source circuit, such as the aging and rupture of the rubber air pipe, the aging, wear of the seal, and the wear of the suction nozzle after long-term use. On the other hand, it is due to the adhesive or dust in the external environment, especially the paper tape packaging. The large amount of waste generated after the components are cut, causing the nozzle of the placement machine to block the setting error on the placement machine program will also reduce the placement efficiency of the placement machine. The solution is to increase the correctness of the placement machine manufacturer. The intensity of customer training allows customers to get started more quickly. The quality of the electronic component itself, the suction nozzle picks up the electronic component placement, the pin is not completely stuck in, or it is directly bent or broken. In this case, the quality of the purchased and mounted components can only be well controlled. This will not only affect the mounting efficiency and product quality. The suction nozzle often picks up and mounts such components, and it will also cause varying degrees of damage. , Over time, the service life of the nozzle will be reduced.


An SMT placement machine production line usually includes a high-speed placement machine and a high-precision placement machine. The former mainly mounts chip components, while the latter mainly mounts ICs and special-shaped components. When the time for these two placement machines to complete a placement process (hereinafter referred to as placement time) is equal and smaller, the entire SMT placement machine production line will exert greater production capacity. In order to achieve this goal, the placement program can be processed as follows.


(1) Balanced load distribution. Reasonably allocate the number of components to be mounted on each SMT device, and try to make the mounting time of each device equal. When the number of components to be mounted on each device is allocated for the first time, there will often be a large gap in mounting time. This requires adjustments to the production load of all equipment on the production line according to the mounting time of each device, and the mounting time Some components on the longer equipment are moved partly to another equipment to achieve a balanced load distribution


(2) SMT equipment optimization. Optimizing the numerical control program of each device is to make the placement machine meet these conditions as much as possible in the production process, so as to achieve higher-speed placement and reduce the placement time of the equipment. The principle of optimization depends on the structure of the device. Some principles will be contradictory when optimizing the program, and a compromise is considered to select the best optimization plan. Optimization software can be used in load distribution and equipment optimization. The optimization software includes equipment optimization procedures and production line balancing software. The optimization program of the equipment is mainly optimized for the placement program and the configuration of the feeder. After obtaining the component BOM table and CAD data, the placement program and feeder configuration table can be generated. The optimization program will optimize the movement path of the placement head and the configuration of the feeder to minimize the placement of the head. Move the distance to save mounting time. Production line balancing software is an effective tool for optimizing the entire production line. The optimization software uses certain optimization algorithms. The current optimization software has a certain degree of intelligence, which can complete the optimization process faster, better and better.


Eliminate bottlenecks; SMT placement machine production line is composed of multiple automation equipment, when the speed of one equipment is slower than other equipment, then this equipment will become a bottleneck restricting the increase in the speed of the entire SMT production line. Generally, bottlenecks often appear on the placement machine, and the only way to eliminate the bottleneck phenomenon is to increase the placement machine. Under normal circumstances, we will purchase a high-speed placement machine, a multi-function placement machine, because it has the characteristics of both a high-speed machine and a high-precision machine, and the range of placement components covers high-precision placement machines and high-speed placement machines , It can solve the bottleneck problem caused by high-speed placement machine or high-precision placement machine. The current development trend of placement machines is also in this direction to meet the needs of the market. ; Adding a placement machine to the production line can solve the bottleneck problem and speed up the rhythm rate. This method provides more production capacity and more feeder positions to better balance the production line without significantly increasing the production line management Complexity, which is far greater than the increased production capacity of a single placement machine. Implement strict and effective management measures; SMT equipment is a mechatronics precision equipment. Implementing strict and effective management measures at work is an important way to improve the efficiency of the SMT placement machine production line. For example, install the components to be supplemented on the spare feeder in advance; while the production line assembles the last few pieces of the previous batch number, make preparations for the next batch of products on the production line. ; The SMT placement machine production line is a large-scale production line, and the output value is calculated in seconds. In addition to equipment and environmental factors, the fluency of production and the quality of products, human factors occupies an extremely important component. If the operator is familiar with the equipment, it will take less time to troubleshoot the problem during the production process, which can also save production time and improve production efficiency. Therefore, we must also pay attention to the training of employees. ; Periodic inspection and maintenance of SMT equipment is also one of the guarantees to give full play to its powerful guarantee. Therefore, we must always insist on regular scientific inspection and maintenance of the equipment to keep the equipment in good condition.

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