Jinling Grand Event Adhesive Future - The 8th "Bonding Day" Bonding & Composite Technology Exchange Conference (Part 1)

On July 24, 2023, the two-day Eighth "Bonding Day" Bonding & Composite Technology Exchange Conference opened successfully. The event was held at Nanjing Huajiang Hotel. There were more than 410 participants in this conference, and guests from 9 major industries and more than 180 companies held a high-level technical exchange conference.

Please take a sneak peek at the live action at the conference:

Summary of conference speech

     Mr. Zhang Yuxian, general manager of Yifa Bonding & Composites Research Institute, first made an opening speech for the conference. Welcome to the 8th "China Bonding Day"! "Bonding Day" is eight years old and Yifa is 12 years old. At any time, Yifa has been moving forward, serving all industry-related technical fields such as rail transit, automobiles, home appliances, electronics, aviation, construction, testing, and adhesive development technology. With our joint efforts, the Bonding Day platform has gradually accumulated experts in more fields. We encourage everyone to learn from each other and continue to innovate on the Bonding Day platform. Today, we gather in Nanjing, the ancient capital of the Six Dynasties. Here, I announce that the theme of this year’s conference is: Jinling Gala Bonds the Future!

Professor Dr. Andreas Gross, director of the Fraunhofer IFAM Institute in Germany, the initiator of the DIN6701 and DIN 2304 standards, and the chairman of the standards committee. The keynote speech Dr. Gross gave everyone on the Bonding Day was the quality standards of bonding and composite materials technology. In the process of product quality management, ISO9001 defines the limitations that cannot guarantee 100% test quality through non-destructive testing as "special processes". The bonding system is compatible with each other's quality assurance standards for the organization and implementation of bonding technology processes in glue-using companies and is fully in line with the "state of the art technology". As the bonding system is increasingly recognized by various countries and fields, the upgrading of bonding standards is on the agenda. From DIN 6701 to DIN EN 17460 (track), DIN 2304-1 is upgraded to DIN EN ISO 21368 (general). ), there will be a three-year transition period during the standard update process, during which the old and new standards will coexist. The success of the quality assurance standard for adhesive bonding can be transferred 1:1 to the application of fiber composite technology: DIN SPEC 35255 – Quality requirements for composite processes. Fraunhofer IFAM plays a leading role in developing quality assurance standards for these fiber composite materials.

Dr. Zhang Jingfen from Yifa Bonding and Composite Materials Research Institute. Dr. Zhang made a report on "Bonding Day" and Yifa Annual Report focusing on "Scientific and Technological Innovation under the Guidance of Standards". Dr. Zhang introduced "China Bonding Day" as a bonding and composite technology exchange platform, which is now developed through three-dimensional integration and continues to expand in breadth and depth. As the exclusive strategic partner of Fraunhofer IFAM in China, Yifa Bonding & Composites Research Institute has been assisting the entire industry to establish a and unified bonding standards, and has trained more than 5,000 engineering and technical personnel at all levels with bonding and composite material qualifications at home and abroad. Covering industrial fields such as rail transit, automobiles, home appliances, electronics, aviation, aerospace, shipbuilding, construction, wind energy, photovoltaics, adhesives and composite manufacturing. Yifa Bonding and Composite Testing Center has third-party testing qualifications recognized by CNAS. Its testing capabilities include bonding type verification, new project process assessment, incoming material and accompanying sample testing, failure mode analysis, and composite-related testing projects. The business capabilities of Yifa R&D Center include structural design, test and inspection, simulation calculation and model trial production, and its technical capabilities are widely recognized in the industry. As DIN6701 upgrades to EN17460, Yifa Bonding will continue to assist Fraunhofer IFAM in sharing bonding standards to more fields and companies.

The topic shared by Mr. Zhang, senior quality management expert and professor-level senior engineer of CRRC Corporation, is: Internal audit skills for the operation of DIN 6701 bonding system. Mr. Zhang proposed that the audit should focus on objective evidence, and then elaborated on the organizational structure, staffing, contract review, design management, process management, bonding laboratory, storage management, supplier qualification management, supplier process management and internal audit. The key points in the audit process, audit response skills and his rich bonding management experience are shared with everyone through examples.

Professor Li Yongbing, professor and doctoral supervisor of vehicle engineering at Shanghai Jiao Tong University, executive deputy director of the General Motors-Shanghai Jiao Tong University Advanced Manufacturing Technology Joint Research Laboratory, and deputy director of the Shanghai Key Laboratory of Digital Manufacturing of Complex Thin-Wall Structures, shared his speech : Technical challenges and research progress of point connection of light alloys and dissimilar materials. Professor Li introduced the challenges and problems faced by resistance welding, riveting, gluing and other resultant connections in the process of lightweighting the vehicle. Through the research of light alloy self-piercing friction riveting technology, magnetron resistance spot welding technology, aluminum alloy-steel resistance spot welding technology and other technologies, the above difficulties can be solved. As the connection technology continues to develop and change with each passing day, bonding is everywhere, and hybrid connection of bonding and mechanical connection has become a future trend.

After the wonderful speeches by famous experts, there was an "expert discussion" session, through which experts from all walks of life shared their experiences and experiences in the bonding field. The guests on the stage had lively discussions, and the most heated topic was: How to implement the bonding system? What is your experience at work?

Changke Co., Ltd. - Zhou Zhigang The bonding system is not well connected. The main engine factory has its own system, and the supplier has its own system. For example, car lights have their own bonding system, and the impact of bonding grade cannot be judged. How to ask downstream enterprises for the surface quality requirements of lamps? The transmission of surface quality requirements is not perfect. The information passed to the OEM is lost and the bonding system is implemented. Internal control standards and requirements are inconsistent between OEMs. Tangche-Liu Jinfeng's company's bonding worker training includes internal incentive training. Employees use work clothes to do practical training, which is passed down from generation to generation to improve the operator's skills or maintain their skills. Nanjing Puzhen-Wei Peixin put forward the requirement to pay attention to details. For example, surface treatment, cleaning, polishing, and supplier cleaning with industrial paper. The cleaning was done but the tools were wrong, and the cleaning could not meet the requirements. The main problem is that the standards are not understood thoroughly and in depth. The Sifang Alstom-Cheng Shilai bonding system has different landing methods, and many points need to be considered: First of all, personnel awareness must be in place, details must be handled, and the protection should be smooth after gluing. If it is smoothed twice, it will easily exceed the primer. There is usually a lack of edge adhesion testing and insufficient understanding of it; secondly, there is a lack of professional theory, and personnel theoretical skills need to be more specialized; thirdly, production schedule and quality or system conflicts need to be considered, how to choose, which one comes first, must We must give priority to system and quality. Dalian Locomotive-Yang Xiaofang is deeply aware of the requirements for details, and the different skills of operators have a particularly important impact on the quality of bonded products. It is expected that EAB will pay attention to theory and increase technical operation training.

In addition, another question involves the design of the joint. How to analyze the working conditions of the joint during work, how to calculate the load, and how to arrange type test verification? Sifang Co., Ltd. - Shi Fang According to the standard requirements, the A1 curved surface large joint was analyzed by finite element, and the A1 plane joint was calculated through approximate calculation. It is necessary to consider the working conditions, reasonable superposition, fatigue strength, aging vibration and other factors. Zhuji-Liu Fengqin With more than 20 years of experience in using glue, she shared the finite element design calculation and type verification methods for the front windows and side windows of previous German projects. Zhuji-Li Renzhe shared his control requirements and precautions in design from the perspective of supplier management and design review, and proposed that more attention should be paid to customer requirements. The design needs to consider the influencing factors of working conditions and aging, and also proposed the need for type verification. Verify regularly. Siemens-Li Zhu proposed that it is necessary to stay on the same channel with suppliers, otherwise the specific implementation will be difficult. Supply chain management and technical requirements must be strictly implemented in work. The design system must strictly transmit the requirements to the company's internal and external suppliers, collect feedback on qualification requirements, and compare whether they are actually implemented.

The experts who participated in the discussion had in-depth exchanges and discussions, and shared their understanding and experience of design requirements in their respective work fields. During the expert discussion, new sparks burst out while thinking collided, and it also provided various inspirations for the guests on site, and the theme of the Bonding Day was reflected.

Mr. Chen Xijia, technical director of Yifa Bonding and Composite Materials Research Institute, gave a speech entitled: Discussion of typical issues in bonding and composite material design. Chen Gong's speech mainly focused on the long-term service life evaluation of adhesives and the design and verification of composite structures, two issues that everyone is concerned about daily. At present, accelerated aging tests are mainly used to evaluate the long-term service life of adhesives. However, there are the following problems: the adhesive is not a single component, the actual use conditions of the adhesive are greatly different from the laboratory conditions, the aging cycle and cost are high, and the amount of testing is huge. The adhesive selection service platform jointly developed by Yifa and Fraunhofer IFAM of Germany can realize the calculation of bonding joint grade, preliminary design of bonding structure, automatic recommendation of suitable adhesive parameters, query and download of adhesive TDS/MSDS data, and third-party bonding test reports. Query and query bonding simulation material parameters. Through case analysis of composite product design and development, the process and experience of composite design and development are introduced in detail.

Mr. Hu, deputy chief engineer of Zhengzhou Zhongyuan Silande High-Tech Co., Ltd., the topic he shared this time is high-performance adhesives for advanced composite material molding and connection. By comparing various physical and chemical performance test data of adhesives, Mr. Hu introduced adhesives for composite material molding, adhesives for composite material connection and functional sealants, their performance characteristics and typical applications. Their application fields include aviation , military industry, electronics, locomotives, construction, photovoltaics, water conservancy, anti-corrosion, etc.

Director Cheng of Qingdao Sifang Alstom Technical Service Department, the topic of his speech today is the details and quality of bonding process. Chenggong introduced the advantages of bonding, the details and characteristics of the process, and shared his experience in using bonding technology through a case analysis of windshield disassembly and the resolution of defects in the bonding process. Glue = Jiao, Bonding ≠Gluing, action≠Implementation, details determine success or failure is not a slogan, the control of details comes from a high sense of responsibility and professionalism, which is closely related to quality and cost.

The technical service expert of Bostik (Shanghai) Management Co., Ltd. talked about Moson. He gave us a speech titled: Bostik’s sustainable development plan in general transportation. Bostik is now used in many fields such as general transportation and automobiles. It has the characteristics of safety, environmental protection, efficiency improvement and emission reduction, and provides customers with technical services such as rubber selection. Introducing the application of adhesives such as silane modified adhesive sealant, floor leather adhesive - hot melt pressure sensitive adhesive, acrylic structural adhesive, UV curing instant adhesive and online molding sealant. Bostik is committed to becoming customers' first choice on the road to sustainable development. Innovation partner.

Wei Gong, senior engineer of CRRC Nanjing Puzhen Rolling Stock Co., Ltd., shared the topic: floor cloth bonding and maintenance. Focusing on the five aspects of floor cloth material selection, glue selection, bonding operation process, floor cloth bonding standards and floor cloth maintenance, Wei Gong gave an in-depth introduction to the process of floor cloth bonding and maintenance, including floor cloth replacement and renovation. Operation process. Through the sharing of floor covering installation and maintenance cases, the operation process and precautions are explained in detail, which has very good guiding significance and gives everyone a new understanding of floor covering bonding technology.

Chao Gaoyi, director of the testing center and senior lecturer of Yifa Bonding & Composite Materials Research Institute, Mr. Chao’s speech was titled: Bonding Aging Standards and Test Methods. Chao Gong first introduced the causes of accelerated aging and the testing standards and methods by elaborating on the aging factors that affect joints. Then, the problems and difficulties faced in the accelerated aging process were shared. Finally, through application cases in the aerospace field, the aging test process and precautions were shared.

As the "Bonding Day" forum's influence has increased, it has attracted a number of first-class adhesive-related companies at home and abroad to participate in the exhibition, including glue companies, surface treatment companies, and testing institutions. Among them, Bostik, Zhongyuan Silande, Shengtong Laser, Lishi, Qingdao Viotong, Changzhou Coffey, Tangshan Weston, Qingdao Ruigao and other companies brought their competitive products and latest technologies to the scene. Their booths There were a lot of people in front of us and the exchange was lively.

Welcome dinner highlights

      At the welcome dinner on the first day of the conference, since most of the guests attending the meeting were EAS (European Adhesive Technicians) and EAE (European Adhesive Engineers) students trained by Yifa, the dinner was like a large-scale class reunion, and students met and drank. Extremely affectionate! New members and old members got to know each other, and the atmosphere at the dinner was extremely lively!
      At the same time, the prizes during the lottery and Q&A sessions at the dinner were particularly exciting. Guests were eager to try and participated in the event one after another. The scene was very lively!

This is the live report of the first day's meeting. If you are satisfied with today's meeting, please give it a like :) Stay tuned for the second day's meeting~

To be continued~