Tag: PCB Assembly

SMT (Surface Mount Technology), or surface mount technology, is one of the most popular technologies and processes in the electronics assembly industry. In the Pearl River Delta represented by Shenzhen, the electronics and information industry is developed and the industry chain is complete. It is a veritable factory in the world.

As the market environment changes and technology changes, in order to meet the increasingly personalized needs of end customers, manufacturers are constantly improving their products, constantly innovating according to market needs, and developing trendy styles and functions to adapt to the current market demand. In order to be able to quickly respond to market diversified and uncertain needs and quickly provide products that meet customer needs, “short, flat, and fast” has become an important feature of production sites during this period, on time, quality, quantity and at a minimum cost Manufacturing products that meet customer needs has become the goal of production management, but progress is seemingly more and more difficult due to resource constraints such as limited skilled personnel and tight equipment. In this case, SMT production is now in a state of small batches and multiple varieties. Because of the inherent production characteristics of the SMT production line, it uses the best production efficiency in large batches. Therefore, for small batches and multiple varieties, there are multiple line changes to complete the production conversion of the product. The SMT line is in an intermittent production state. The increase has caused problems in the production efficiency of the SMT line.

One
Benefits of small batches and multiple varieties

1.Improve adaptability to changes in demand
Small batch, single piece delivery
Reduce job preparation time
Multi-skilled employees
In-process quality assurance system
Generalization of equipment and tooling

1. Make manufacturing issues and their weaknesses visible
   Quality failure
   Equipment failure
   Workload imbalance
   Turnover time

2. Eliminate waste caused by improper production management and reduce production management costs
   Material waiting due to improper production management
   Unnecessary model changes due to improper production management
   Increase in indirect operations due to improper production management

4.Improve the adaptability of manufacturing to short delivery time
Eliminate stagnation (things / information)
Reduce the number of intermediate work in process
Synchronization

two
Characteristics of small batches and multiple varieties

Multi-variety parallel

Because many enterprises’ products are configured for customers, different products have different needs, and the resources of enterprises are among multiple varieties.

Resource sharing
Every task in the production process requires resources, but the resources that can be used in the actual process are very limited. For example, the problem of equipment conflicts often encountered in the production process is caused by the sharing of project resources. Therefore, limited resources must be properly allocated to meet project needs.

1. Uncertainty of order result and production cycle
   Due to the instability of customer needs, the clearly defined nodes are inconsistent with the complete cycle of human, machine, material, method, ring, etc., the production cycle is often uncertain, and projects with insufficient cycles require more resources. , Increasing the difficulty of production control.

three
Difficulties in small batch and multi-variety production

1. Dynamic process path planning and deployment of virtual unit lines: emergency insertion, equipment failure, and bottleneck drift.
2. Identification and drift of bottlenecks: before and during production
3. Multi-level bottlenecks: bottlenecks on assembly lines, bottlenecks on virtual lines of parts, how to coordinate and couple.
4. Buffer size: either backlog or poor interference resistance. Production batch, transfer batch, etc.
5. Production scheduling: not only consider bottlenecks, but also the impact of non-bottleneck resources.

Many varieties and small batch production models will also encounter many problems in enterprise practice, such as:
Multi-variety and low-batch production, mixed scheduling is difficult
Unable to deliver on time, too much “fire fighting” overtime
Order requires too much follow-up
Frequent changes in production priorities, the original plan could not be implemented
Increasing inventory but often lacking critical materials
The production cycle is too long, the lead time is infinitely expanded

▎How to implement automatic upgrade has become a trouble for OEM companies

The electronic information industry is still a pillar industry in Shenzhen, with an industrial scale of more than 1.200 billion yuan, accounting for about 1/7 of the national electronic information manufacturing revenue. In Shenzhen, there are a large number of leading electronic information companies such as Huawei, ZTE, and TCL, as well as a large number of small-scale lean manufacturing and processing enterprises that were born in response to the needs of the times.

Due to the production characteristics of traditional foundry companies, “different bills of materials for each order, different production processes, different cleaning standards, different packaging requirements, and different labeling specifications”, unlike large factories that do standard products, they can be automated on a large scale upgrade.

How to use industrial robots, advanced automation management platforms, and information technology to help these enterprises achieve flexible production and agile manufacturing are the topics they care about in common.

Under the pressure, many traditional OEM companies have begun to transform to ODM (Original Design Manufacturer), and gradually pay attention to independent intellectual property rights, start to make innovative products, and start to develop independent brands.

▎ Machine substitution may be a “beautiful trap”, how to realize flexible production is the key

China’s Industry 4.0, like an aircraft carrier, propels China forward. For these small and small batch OEM companies, after experiencing the “prosperity era” brought by the demographic dividend, they are also thinking about how to take the road of independent innovation.

Perhaps many OEM companies rely on the channel advantages accumulated over many years of operation and the natural industrial chain advantages of the Pearl River Delta. But the demographic dividend is no longer, the cost advantage is no longer, and the rise and penetration of the Internet has also led to major changes in production methods, management concepts, production equipment, and even raw materials. These factors have begun to cause some entrepreneurs to worry about the future.

“Without the independent innovation of Chinese companies, we can only be a world factory. Without trial and error and iteration of research and development, we will never have our own core technology.”

How to innovate? Is machine substitution really the general trend?

For these manufacturers, there may be pitfalls in purely pursuing “machine substitution” oriented by automated equipment, mass production, and reduced manufacturing costs. Because for them, the key to “machine substitution” is how to implement software flexibility, agile programming, or automatic programming, just like “quick mode change” in TPS (transaction processing system).

How to distinguish between PCBA board cleaning and non-washing in automotive electronics?

Edited by Ming: ming@smthelp.com

Customers often do not understand why automotive electronics PCBA boards need to be cleaned reliably. Which electronic PCBAs need cleaning before use? Which ones don’t have to be cleaned? It is also difficult to distinguish and judge. The purpose of this article is to analyze the necessary reliability cleaning of automotive electronics PCBA, hoping to help customers and readers.

In order to realize the control of driving and clock functions in the car, various types of electronic circuit boards are used to realize various control functions: engine driving management system or engine driving computer ECU, and new energy vehicles have more circuit boards, each of which is on average. The car has a circuit area of ​​1.5 square meters and more than 100 electronic circuit boards. These types are in electronic circuit boards that implement various functions. What needs cleaning? Which do not have to be cleaned?

The function control panel of the car electronics is cleaned and not cleaned, and is often distinguished from the driver’s personal safety, the safety of the driving scene and the safety of the property. The function control related to the safety of the car and the personal safety of the third party is required. Do the cleaning to achieve high reliability technical requirements: for example, the engine management system ECU circuit board, the new energy vehicle power management system BMS circuit board and so on.

The car also has other management systems, lighting control systems, navigation, music playback entertainment systems, door and window control and glass lift, seat functions and other auxiliary functions, because the density of these systems and human life safety is not too great, Often such electronic circuit boards can be made from no-clean, thereby reducing cost and meeting performance requirements.

Driving circuit ECU, new energy vehicle BMS power management system process circuit board process cleaning, cleaning circuit board surface residue, removing flux, solder paste residue and residual effects of other pollutants in the process, truly reach the circuit The surface of the board assembly is clean, and the degree of ionic contamination is used as an indicator to measure the cleanliness of the board surface. This is the technical indicator that can truly achieve reliability guarantee. It can greatly improve the safety and reliability of the circuit board assembly products, and avoid unnecessary risks caused by the electrochemical corrosion of the circuit board and the defects caused by electromigration caused by poor working conditions, humidity and high temperature.

In summary, all component processes that are closely related to life safety and driving safety must be reliably cleaned. It is currently recommended to use an environmentally safe water-based cleaning process.

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