Precision PCB Fabrication, High-Frequency PCB, High-Speed PCB, Standard PCB, Multilayer PCB and PCB Assembly.
The most reliable PCB & PCBA custom service factory.
The design of the smt production site must put safety production in one place. Since smt equipment is generally installed in line, the length of the production line is relatively long (for example: a high-speed smt line has a total length of 25-35M), and the load on the ground is relatively More concentrated. After a single high-speed placement machine is loaded with a Feeder, the total weight will exceed 6000kg, so there is a higher requirement for the load-bearing capacity of the plant floor. Generally, the smt high-speed line is installed in the plant, and the load-bearing capacity of the plant floor is recommended Not less than 7.5KN/m2, or even 10KN/m2. If the bearing capacity of the floor is too low, after the equipment is installed and used for a period of time, the floor is prone to deformation or cracks, which affects the reliability of the equipment operation and the accuracy of processing. .
The power supply equipped at the smt production site should be sufficient and safe. Smt equipment generally uses compressed air and power supply as dual power, and the requirements for gas-electric cooperation are relatively strict. Reflow welding machines and wave soldering machines are all large-scale electricity It is necessary to fully consider the impact of their startup and shutdown on other electrical equipment. The power configuration system adopts a three-phase five-wire system for safety, and some companies combine protective grounding and neutral wiring into one. There is a great sense of insecurity in the method. The low quality of the power supply of the power grid may cause damage to the production equipment. In the past few years, the smt equipment we used had caused reflow welding due to abnormal changes or sudden power outages in the Beijing Northeast Power Grid. Machines, multi-function placement machines, and wave soldering machines have failed many times, and even damaged electrical components. In some areas where the grid voltage fluctuates more severely, the smt equipment should be equipped with AC stabilized power supply, and attention should be paid to the three-phase power supply wiring of the equipment. The balance of power load.
The smt production equipment requires the use of clean and dry compressed air. As the power source, the compressed air should not only meet the technical requirements of the equipment in terms of pressure, flow and other parameters, but also remove the water, oil, and dust contained in the gas before entering the machine. And other impurities are filtered out.
The smt equipment will produce a certain amplitude of vibration during operation, especially when large-scale high-speed placement, the vibration caused by the plant is more obvious. If you compare GB 1070-88<
A bright and clean factory building helps employees to work attentively and also helps to ensure the quality of production. For the smt production site, the illumination level is recommended to be no less than 300 lux (note: measured at a height of 800mm from the ground). For some requirements, lighting A better work area can be installed with local lighting. Some auxiliary materials such as smt production equipment, smt patch glue, solder paste should be used within a certain temperature range in order to maintain its specific special performance and good manufacturability. Generally speaking In other words, it is more appropriate to control the temperature in the PCB factory building within the range of 18 degree Celsius-26 degree Celsius. In the winter heating season, or in the case of using air conditioning in summer, it is necessary to inject a certain proportion of fresh air into the factory building. Necessary The fresh air volume should be able to provide enough oxygen to meet the breathing requirements of indoor personnel to maintain normal physiological activities.
In the process of smt production, it is necessary to use anhydrous ethanol, flux and other types of solvents and other flammable materials, and the fire safety design in the production area and warehouse is necessary. Plant design, construction and large-scale technical transformation projects Implementation should be reviewed by the fire department. For the storage of valuables, components and the production of valuable products (such as mobile phones), not only effective safety management measures must be formulated, but also safety and theft prevention must be taken as an important part of the design of the production area. The important content is considered. Many mobile phone manufacturers have experienced mobile phone products and mobile phone batteries being stolen, so that the general assembly workshops of some mobile phone manufacturers are equipped with anti-theft security systems that are no less than those of civil aviation airports. Security inspection system.
The importance of electrostatic safety protection has been recognized by more and more people. Strictly speaking, the entire smt production site should be designed in accordance with the standards of electrostatic safety work area. Electrostatic protection is a systematic project and should be regarded as total quality management Part of it has attracted the attention of all employees. In the production area, not only must be equipped with all kinds of necessary electrostatic protection equipment, but also relevant personnel must be regularly educated on electrostatic protection knowledge, and consciously entertain the electrostatic protection process regulations, production and work sites A good grounding system should be designed (for example, the resistance to ground should be less than 4 ohms), and the ground of the plant should have anti-static performance, or lay an anti-static floor mat.
With the development of productivity, the environmental pollution and resource consumption caused by human production activities have become more and more serious threats to human health and sustainable development, which has aroused the general concern of various families. In addition, the increasingly fierce competition between each The establishment of relevant environmental laws and regulations, society’s expectations for the environment and many other factors have also prompted companies to pay more attention to their environmental performance and environmental image. The design of any industrial plant should follow the company’s people-oriented principle. Many modern companies are designing smt production sites. The concept of "green production site" is always introduced.
At the installation site of smt equipment, if the building structure space of the workshop is relatively narrow and the material with high reflection coefficient is used (the sound absorption coefficient is small, α<0.02), the sound absorption capacity is almost no, and it is completely reflective, so that The indoor noise is continuously strengthened by reflections, producing a strong reverberation effect. The main component of the noise in the workshop is mechanical noise, accompanied by some aerodynamic noise, so most of the noise can be reduced by sound insulation and sound absorption. Treatment. The use of materials with strong sound absorbing ability for the ceiling of the plant will help reduce the reflection of noise. The noise control standard should be in accordance with the <
Electromagnetic radiation has been recognized as the four major pollution sources after water pollution, air pollution, and noise pollution. Excessive electromagnetic radiation will endanger the health of operators. There is a certain model produced by a company in Asia The placement machine was once stopped on the European market because the electromagnetic radiation of this machine exceeded the safety standards in Europe. Therefore, when selecting and purchasing smt production equipment, the electromagnetic radiation that the equipment may generate should be Put forward requirements to ensure the personal safety of operators.
The air pollution source program at the smt production site mainly comes from the smoke and dust generated by wave soldering, reflow soldering and manual soldering (the main components are lead, tin vapor, nitrogen oxides, ozone and carbon monoxide and other harmful gases). Human health hazards are serious, and effective measures must be taken to purify the air in the workshop. The exhaust gas emission system designed and installed in the production area should have sufficient emissions, and the emission standards and emission heights should comply with the regulations of the local environmental protection department .Smoke filters can be installed in some stations to absorb and filter out harmful gases. In the environmental design of the smt production site, the following relevant evaluation standards should be followed. 1. <
The disposal of waste generated in production activities is an important link. Chemical products, such as waste gasoline, engine oil, alcohol, and waste solder paste, patch glue, flux, solder slag, etc., are recommended to be collected in a centralized manner. Units with processing capacity and compliance with domestic environmental protection requirements should not be discarded at will. Other recyclable waste generated, such as packaging materials for SMD components, should be stored separately and handed over to the garbage disposal station for processing.
The process layout of the smt production site should be efficient and orderly, and the logistics route should be reasonable and consistent with the process flow. The logistics route should be as short as possible to improve the efficiency of production and management. For all types of production involved Articles should be classified into categories, and fixed management should be implemented. All working areas and storage areas for various articles should be clearly marked. All kinds of articles that are not related to the production site should be resolutely removed from the scene. Advanced production sites should be designed. It can reflect the management characteristics of "balanced and orderly production, scientific process layout, reasonable labor organization, clear job responsibilities, and elimination of invalid labor".
