SMT Production Research Articles

Real-Time Energy Consumption Sensing System in SMT Intelligent Workshop

How to ensure the "carbon peaking and carbon neutrality" goal is a crucial problem for China with good performance, low cost and limited time. As a pillar industry, the manufacturing industry need offer more great potential helps. In this paper, for the intelligent workshop, firstly, an energy consumption architecture, based on mutual inductance sensing technology & a multi-granularity production line energy consumption modeling, is put forward. Secondly, the device-level sensing technology demonstrates the detailed implementation for the multi working condition machines whose power is unknown. And then, the research devoted the basic aspects of the proposed multi-granularity production line energy consumption modeling and summarized the implementation elements of 3-matrix (the attribute attributes, power attributes and cumulative timing attributes). Above the 2 sections, the robot and SMT production lines case studies are presented separately. Results show that the architecture can effectively sense and model the energy consumption of the devices and the workshop, which provides an available method for the fine management and control of energy consumption and energy efficiency. Through this study, we hope to provide some reference ideas for future researchers.

An Automatic Assembly SMT Production Line Operation Technological Process Simulation Model Development

This article describes an automatic assembly SMT production line operation technological process simulation model development within the framework of modern cyber-physical production systems. In the course of the research, the authors conduct an analysis of modern publications on the topic of research, and the need to find new approaches for modeling the work of a production line at the initial stages of design. This makes it possible to assess the load on each element of the system at the design stage, and identify disadvantages at the early stages of production planning. The authors give an example of the task solution for modeling a fragment of an automated production line of SMT assembly, based on the use of typical mathematical schemes of mass service systems (MSS). A description of the functioning of the technological link of the process is carried out, and a Q-diagram of the technological process of SMT assembly is developed. Using the simulation modeling language GPSS and the technological parameters of the selected equipment, a block diagram was developed, on the basis of which the program was written and the work of the SMT assembly production line was simulated. The obtained results further allow us to estimate the production capacity, the loading of each equipment, the functioning processes of both the selected fragment, and the developed model and they can be applied to the simulation of large production lines within the framework of PCB production.

基于Plant Simulation的SMT生产线仿真技术研究

基于Plant Simulation的SMT生产线仿真技术研究

Discussion on Application of Intelligent Manufacturing Technology in SMT product assembly manufacturing system

Intelligent manufacturing techniques has attracted much attention in SMT manufacturing system in recent years. A brief introduction to the basic idea of introducing intelligent manufacturing techniques to form SMT products intelligent manufacturing systems is described. Based on the analysis of SMT manufacturing system technical characteristics and problems, the basic composition and key technologies of SMT products intelligent manufacturing systems and technical system architecture are discussed.

The Model and Simulation of SMT Production

Because of product variety of small electronic products enterprises,Their equipment is in condition of half stop production, resulting in the waste of equipment and personnel. Canon cell production from mixed line production mode innovation out of a new way of production, applicable to the production equipment is not too big, need manual operation of the production. This paper tells small batch orders and the premise, split mixed line composed of Canon cell production to improve production efficiency, reduce the cost. It gives the mathematical model and the simulation results.

Real-Time Text Detection in Color Images Based on Color Projection

In SMT production line, different types of components may have the same shape but providing different functions. The only difference between these components is the text on surface of a component indicating its type. Therefore, not only geometry defect inspection but also text detection is needed in component inspection to avoid wrong use of components. Traditional algorithms based on pixel comparison of text image are time consuming and sensitive to tiny change of the text as well. A concise text detection algorithm based on color projection is proposed. The algorithm transfers two-dimensional color image to one-dimensional curve for comparison by projection of the text image, which greatly reduces the computing amount, increases speed and makes the algorithm less sensitive to displacement or rotation of the text. Experiments show that the algorithm can ensure effective real-time text detection.

Gaining flexibility in SMT production

Gaining flexibility in SMT production

Research on Workshop Scheduling of SMT Product Manufacturing System

In this paper, taking workshop scheduling of SMT product manufacture system for object, the conception of resource cost is incorporated with Petri Nets. The workshop scheduling model of SMT product manufacture system is build based on transition timed Petri Nets (TC-TPN). ω1 proportion of processing cost, ω2 proportion of processing time, ω3 mutation factor are chosen as the key factors using the improved heuristic A* scheduling algorithm. The result shows that: considering the processing time preference, when ω1=0.7, ω2=0.2, ω3 =0.1, the processing time is reduced by 5.83%, 3.45%, the processing time is decreased by 6.14% and 2.94%; however, considering the processing cost preference, when ω1=0.1, ω2=0.8, ω3 =0.1, the processing time is reduced by 1.94%, 0.86%, the processing time is decreased by 8.06% and 7.52%.

Build-to-order in SMT production

Constantly changing production volumes, small lot sizes and an increasing variety of versions also have an influence on electronics manufacturing. Siemens Electronics Assembly Systems GmbH & Co. KG (SEAS), Munich, has reacted to this situation by presenting “Siplace SX”, the world’s first placement machine designed entirely for build-to-order processes.

Assessing the impact of contamination in an SMT production environment

Assessing the impact of contamination in an SMT production environment

SOLDER PASTE INSPECTION BY SPECIAL LED LIGHTING FOR SMT MANUFACTURING OF PRINTED CIRCUIT BOARDS

Solder paste screen printing is the first and very critical stage of manufacturing in an SMT production line of printed circuit boards (PCBs). Many defects can be eliminated with proper paste inspection. Conventional inspection method would depend on an image acquired from a camera mounted from the top. This 2D inspection of solder paste based on images is fast but is limited to defect such as bridge or no solder. Defects related to the volume of the printed solder paste or unevenness of the paste cannot be treated from a top image. The proposed method of this paper would involve the use of special directional LED lighting from the side. A sequence of four images is acquired and image processing is carried out for the edge information of the printed solder paste. The proposed method can handle other types of defects that cannot be treated by conventional top lighting images.

Closed loop quality control in printed circuit assembly

Almost 30-50% of fabrication costs in electronics production are caused by testing and repair operations. The reasons for that problem are many. First of all, there is still a lack of knowledge concerning the conditions for robust process control. On the other hand, uncertain specification of product quality causes unnecessary inspection, testing, and repair actions. Thus, a strategy for yield improvement requires strong dedication to causal relationships and specification of process and product quality. In the first step, critical process parameters and their causal effects on product quality must be analyzed. In the second step, once critical process parameter are addressed, control strategies can be developed to assure high first pass yields. This paper gives an overview of ongoing work that has been performed to establish a SMT production line with closed loop quality control via direct process monitoring capabilities and integrated inspection operations. For different inspection tasks, 3-D laser and X-ray inspection is applied. Process parameters as well as test and inspection results are gathered on line. Thus, interrelationships between different process steps, beginning from material inspection, solder paste application, components placement, reflow soldering, and final inspection, can be analyzed. Moreover, variation of process parameters conforming to different approaches to design of experiments (DOE) can be performed while running production. On-line diagnosis of process parameters and inspection results enables a closed loop quality control.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Laser Trimming SMTs: Automating the Final Electrical Adjustments

In SMT manufacturing, automation is the key to achieving the highest throughput at the lowest cost. Complex devices of various shapes and sizes often require final electrical adjustments under operating conditions to ensure conformance to electrical specifications. This paper describes the process of laser trimming completed SMT devices and the advantages it has over conventional trimming methods. The material presented is based on laser trimming systems currently used in SMT production applications that will also be described.