Extraordinary Beyond Excellence - Record of the 5th "Bonding Day" Bonding & Composite Technology Exchange Conference (Part 1)

On July 13, 2020, the two-day fifth "Bonding Day" Bonding & Composite Technology Exchange Conference opened successfully. The conference was held in Longcheng Changzhou. A total of 327 people attended the conference. Guests from 8 industries and 117 companies jointly held a high-level technical exchange conference.

Group photo

The meeting was hosted by Wang Wentong, member of the Party Working Committee, deputy director of the Management Committee and director of the Organization Department of Longcheng Changzhou Economic Development Zone, where Yifa New Materials Research Institute (Jiangsu) Co., Ltd., a subsidiary of Yifa Bonding and Composite Materials Research Institute, is located. Welcome.

Wang Wenyi

Zhou Mingzhu, deputy director of the Organization Department of Changzhou Economic and Technological Development Zone, described the "vital place of Changzhou Economic and Technological Development Zone and the east gate of Changzhou" with the five "excellent" colors of "industrial advantages, preferential policies, beautiful ecology, high-quality services, and generous remuneration". "Vivid image.

The chairman of the conference, Prof. Dr. Gross, addressed everyone from a distance, strongly expressing his regret that he could not attend the conference in person, and agreed to meet with everyone next year.

On behalf of Professor Gross, Mr. Zhang Yuxian, general manager of Yifa Bonding and Composite Materials Research Institute, stated that "the basis for the success of every bonded joint: knowledgeable, experienced, qualified and responsible people." From the perspective of the impact of personnel qualifications on special bonding processes, the history of Fraunhofer IFAM bonding personnel qualification training was reviewed. Professor Gross summarized the personnel qualification training model of the Fraunhofer Academy of Sciences based on ISO 17024: the knowledge generated during the research and development process is transformed into vocational and technical training, and the creators of knowledge become disseminators of knowledge. This practice produces unique knowledge. There is no doubt that the model will be successful. Experts in the field of scientific research directly impart knowledge to students, and the content taught is updated in a timely manner to ensure its accuracy. Knowledge communicators who come from scientific research practice cannot be compared with just any amateur players. Fraunhofer's certificates are valid all over the world, and its expert capabilities are internationally recognized. More than 28,000 German scientists from the Fraunhofer Academy of Sciences in the fields of natural sciences and engineering technology are our strong backing.

Mr. Zhang

Dr. Zhang Jingfen from Yifa Bonding and Composites Research Institute made the "Bonding Day" and the annual update report of Yifa Bonding and Composites Research Institute, so that everyone can further understand the values and vision of Yifa: Transfer foreign advanced technology, cultivate and improve technical capabilities, and become a leader in the research, promotion and standardization of professional bonding and composite material application technologies in China.

Dr. Zhang

A famous figure in bonding days, a doctor of German engineering, a professor, and a doctoral supervisor. He was once the chief expert of composite materials technology in the Aviation Industry Corporation of China, and is currently the chief professor of composite materials technology at the University of Nottingham Ningbo. He is also the president of the International Society for Advanced Materials and Process Technology, and a number of A core member of a world-class academic organization. The topic that Professor Yi shared with everyone is: the past and present of aerospace structural bonding and composite material technology. Starting from the work done 35 years ago, professional details and development allusions are readily available. Professor Yi shared the development history of bonding in the aerospace professional field. A large number of microscopic photos were used to visually demonstrate the surface morphology of anodized aluminum to the participants. From bulk material to barrier layer to weak boundary to deep well porous structure of alumina. From these structural photos, participants can easily understand the mechanical adhesion of aluminum alloys when adhering to low-viscosity epoxy primers. They can also easily understand the relationship between the true surface area and the nominal surface area, and understand the actual surface area on the interface. Gain a deeper understanding of the effective surface area for chemisorption and polar attraction. Professor Yi revealed from his understanding the stress concentration points in the high-modulus adhesive layer that affect the strength of bonded joints during practice and testing. Combining the complete theories in EAS and EAE teaching, students learned about the formation of stress cracks and the design of bonded joints. Some principles have a deeper understanding.

Yi Xiaosu

This year's Bonding Day Conference has a new "Expert Discussion". The experts on the stage discussed "What are the typical bonding and composite-related issues at work" and "The control of the bonding process is very important. How do you achieve it at work?" The bonding process is cured?", "Experience in key technologies in lightweight composite material bonding and bonding of multiple materials", "How do you handle the key aspects of bonding process and quality management at work?", "You? How do you do the theoretical calculation of joints at work? How are the verification tests of joints performed? ", "Environmental protection and VOC requirements and your countermeasures", "How does the bonding system really come to fruition? What is your experience at work? ” and other topics were openly shared, and opinions collided on and off the stage, leading to lively discussions. The first time we organized such a discussion, the questions in the audience were a bit divergent, but they gradually improved in the future.

forum

Symposium questions

Symposium questions

Dr. Yu, a senior lecturer at Yifa Bonding & Composites Research Institute and a DVS certified DIN6701 and DIN2304 auditor, shared the common problems he found during the audit process and gave sincere suggestions in a humorous tone. Especially the analysis of the two skin problems discovered during the audit and some interesting test report data taught us that science cannot be faked, quality must be down-to-earth, qualified auditors have a pair of sharp eyes, and only by continuous improvement of quality level and technical level can we This is what the auditors are most concerned about.

Dr. Yu

Professor Gao from Tongji University, director of the Institute of Body Structure and Technology of Tongji University, brought "integrated optimization of CFRP laminate structure and technology" to the conference. For anisotropic CFRP, it is required to consider thickness, layup angle, layup sequence, etc. at the same time. Patented DMTO discontinuous material thickness optimization technology, iterative optimization results show that the weight of the engine hood is reduced by 55%. Professor Gao’s lecture attracted the interest of many professionals in the track industry, and the technical discussion and thinking on cross-industry applications triggered many new inspirations. This is also the charm of Bonding Day, especially his words “The power of technological progress often It cannot be stopped by conventional cost thinking.” We look forward to technological progress, and actively study and prepare to welcome the arrival of the technological revolution.

Professor Gao

Professor Gao’s questions and answers

Professor Gao’s questions and answers

Director Gao of CRRC Qingdao Sifang gave a lecture on "Application of Bonding Technology in Composite Materials for Rail Transit" at the conference, which aroused a rush of questions and discussions. The lightweight topic was very popular and the discussion was heated. Director Gao’s photos of the “Next Generation High-Speed Rail” show us CRRC’s great achievements in technological progress, and also make us feel the determination of central enterprises to keep up with the pace of international advanced technology. The patriotism of Yifa students who have returned from overseas is also deep. Inspired by this, he is determined to work hard throughout his life to promote the technological progress of the motherland and realize the goals of Yifa Vision.

Director Gao

Chen Xijia from the Yifa Bonding and Composite Materials Research Institute gave a lecture on "Composite Material Structural Design and Verification". He used actual research and development cases to calculate the bonding design of high-speed rail hoods and the design and development of carbon fiber parts to demonstrate the use of composite materials for design. Calculation and experimental verification methods for manufacturing, and introduced the European Composite Technician (Composite-S) course, European Composite Material Manufacturing (Composite-M) and European Composite Material Repair (Composite-R) personnel qualification training to be launched by Yifa course.

Chen Xijia

Zhao Gong, a professor-level senior engineer from Datong Electric Locomotive, puts the performance requirements for polymer materials used in locomotive cabs from the aspects of environmental protection, combustion safety, vibration reduction and sound insulation, cold protection and heat preservation, bonding applicability, and use and maintainability. A professional presentation was given.

Zhao Yafeng

Secretary-General Wang of the Building Insulation and Decorative Integrated Panels Association combined industry trends and policies and regulations to describe the current situation, development prospects and bonding needs of energy-saving integrated panels. Energy conservation is an important topic guided by national policies and regulations, and the bottlenecks in industry development and pain points in bonding urgently need to be resolved.

Wang Lin

Zhao Gong, a senior engineer from CRRC Tangche, described the EPDM bonding surface treatment technology and compared the effects of different methods such as acid, alkali, and plasma treatment on the bonding performance and bulk performance. This is It was an issue that many people were concerned about, and there were a lot of questions on the spot.

Zhao Hui

Mr. Hang, senior training instructor of Yifa Bonding & Composite Materials Research Institute and DVS certified DIN6701 and DIN2304 auditor, gave a lecture on "Design and Verification of Adhesive Joints", how to simplify the calculation workload without affecting the calculation accuracy, and also Calculation method to meet load requirements? What are the factors to consider? The difference in thermal expansion coefficients of different materials, strength and deformation are important parameters to determine the maximum load-bearing capacity. Long-term stability considering aging factors, dimensional design methods, etc. not only attracted the attention of the audience, but also aroused the interest of many professionals outside the venue. .

Hangxiang

Li Gong, who comes from supply chain management of CRRC Zhuzhou Locomotive Co., Ltd., has studied fire prevention and VOC for many years. The definition and evaluation latitude of VOC, and the evaluation and testing methods for the total amount and component of VOC.

Li Renzhe

Hu Jun, director of the Testing Center of Yifa Bonding and Composite Materials Research Institute, talked about "Verification Requirements in the DIN6701 System", described bonding-related testing standards, and introduced Yifa's testing capabilities. Yifa Testing Center has passed the CNAS qualification accreditation. It has a 1,000 square meter testing site and many professional testing facilities for conventional and bonding and composite materials. It has a professional testing team and currently conducts a number of type tests, process verification, and incoming materials. Test and analysis items such as inspection, accompanying sample testing, bonding failure analysis, etc.

Hu Jun

Du Gong from CRRC Dalian has been engaged in design for more than ten years. He accidentally stepped into the world of bonding. He shared the key points about the process and design of sandwich panels and put forward at least ten pain points that need to be solved. Composite material products The design must take into account the implementation of the process and have redundant design. Trial production is very important and must be done in strict accordance with the process regulations, otherwise you will face huge economic losses.

Du Huiyong

Zhao Min, a senior expert from Qingdao Sifang Co., Ltd., is an outstanding student of the first phase of EAE Huangpu. He shared with everyone the "Floor Cloth Bonding Process Verification Method". He used a method similar to the melting determination of the weld section. Evaluating the bonding effect of floor cloth is really a creative verification, and all the guests at the scene benefited a lot!

Zhao Min

Dr. Xu, senior training lecturer at Yifa and auditor of DIN6701 and DIN2304, has more than 20 years of experience in adhesive development in the electronics industry. In the past five years of working at Yifa, he has conducted research on the application of bonding in various industries from consulting, certification and auditing perspectives. . At the end of May, the first bonding technology training session for the electronics assembly industry this year was just completed for electronics assembly companies.

Dr. Xu's lecture covered bonding principles, properties of glues commonly used in the assembly of electronic components and construction precautions. Common failure modes and causes are analyzed using actual cases to analyze bonding failures.

Dr. Xu

To be continued~

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