Special review of the bonding system of CRRC Qingdao Sifang Rolling Stock Co., Ltd.

From June 18 to June 20, 2024, the Yifa auditor team conducted a three-day special review of the bonding system at CRRC Qingdao Sifang Rolling Stock Co., Ltd. (hereinafter referred to as Sifang). This special review A special review of the bonding system was carried out for Sifang Co., Ltd., Sifang Co., Ltd. Innovation Center, supplier Otmei, and supplier Qingdao Weiao.

1. First meeting

At 9:00 on June 18, 2024, the first meeting of this special review officially started. The people invited to attend were the director of the Technical Engineering Department of Sifang Technology, the deputy director of the Technical Engineering Department, the chief craftsman of the Technical Engineering Department, and the technology engineer of the New Materials Division. Department director, deputy director of the quality management department, director of the general assembly plant, etc. Supplier representatives were the bonding supervision and bonding supervision representatives of Qingdao Weiao and Outemei respectively. The auditor team was composed of Yifa Bonding and Composite Materials Research Zhang Yuxian, general manager of the institute, serves as the leader of the audit team. The members of the audit team include Dr. Zhang Jingfen, Dr. Xu Xiongli, Peng Lin, Chen Jinzhong, and Zhang Qianjin.

Zhang Yuxian, general manager of Yifa Bonding and Composites Research Institute, served as the leader of this review team and served as the moderator of the first meeting. The director of the Technical Engineering Department of Sifang Co., Ltd. delivered an important speech on behalf of Sifang Co., Ltd., emphasizing the importance of systematic management of the special process of bonding. The chief craftsman of the Technical Engineering Department introduced the exploration process and results achieved by Sifang Co., Ltd. in the bonding management system in recent years, and shared the next step in the bonding system work. Supplier representative Qingdao Weiao Bonding Supervision pointed out at the first meeting that the establishment of the bonding quality system provides a strong guarantee for the quality control of the bonding process. Dr. Zhang Jingfen, representative of Yifa, introduced the overall situation of Yifa Bonding and Composites Research Institute, including the development history of Yifa Bonding and Composites Research Institute, the scope of services provided by Yifa in the rail transit field, and development strategic goals, and also introduced the members of the audit officer team who participated in this audit.

Dr. Zhang Jingfen from Yifa Bonding & Composite Materials Research Institute gave a speech

2. Review process

The audit team was divided into two groups. Group A reviewed the Sifang Co., Ltd. factory, and Group B reviewed the suppliers (Qingdao Weiao, Otme) and the Sifang Innovation Center. The details include the following: personnel qualifications, technical requirements Review, bonding joint design, procurement and warehousing, process planning, quality control, bonding site, bonding demonstration.

The audit team reviews the headlight bonding process on site

The audit team is on site to review and discuss the side window bonding process

3. Closing meeting

After three days of review and communication, the review of Sifang Shares and external suppliers has been completed. The review team listed and summarized the problem points discovered during the review. At the final meeting, Dr. Xu Xiongli, a member of the Yifa audit team, read out the various problem points discovered in this audit, and put forward corresponding plans and suggestions for improving the problem points one by one. The responsible persons of the corresponding functional departments discussed the corresponding problems in the final meeting. Question items were discussed and confirmed in detail. Leaders of Sifang Technology Engineering Department, Deputy Minister of Technology Engineering Department, Chief Technologist of Technology Engineering Department and other leaders attended the final meeting and listened to the problems and improvement plans discovered in this system review. Suppliers also attended the final meeting. Representative members. The director of the Technology and Engineering Department of Sifang Technology made the final summary of the review meeting. In his speech, he said that the review work was very successful, both in terms of the cooperation and responsiveness of various departments and suppliers, as well as the professionalism and review of the review team. The results are presented in a manner that expresses great satisfaction and affirmation of the results of this review. At the same time, it puts forward requirements for the improvement of the issues presented by various departments and suppliers in the review, and also proposes further optimization and implementation of Sifang's bonding system. principles and policies.

Yifa Bonding and Composites Research Institute is the exclusive strategic partner of German Fraunhofer IFAM in China. The Fraunhofer IFAM Institute is a global leader in research in the field of bonding, and Yifa has been bringing its advanced research and development results and application technologies to Chinese industrial enterprises. For more than ten years, Yifa has introduced EN17460/DIN6701 and DIN2304 bonding standards into China, starting from the rail industry, covering aviation, automobiles, home appliances, electronics, shipbuilding, construction and other fields, helping the manufacturing industry to establish and improve the bonding application field. technical standards. Conduct EN17460/DIN6701 and DIN2304 certification audits, project support and consulting in China; carry out bonding training and examinations at three levels: EAE European Bonding Engineer, EAS European Bonding Technician, EAB European Bonding Operator with certificates issued by Fraunhofer, and Composite manufacturing Composite_M, repair Composite_R, and technician Composite_S training and examination. Yifa also has self-developed special training courses related to customized bonding and composite material applications.

After more than ten years of intensive development, Yifa has become a leading enterprise in domestic bonding technology and established a professional platform for domestic glue-using enterprises and talents. Yifa has a technical team composed of elite doctors and masters from well-known universities at home and abroad. More than 300 customers have passed Yifa's certification audit, and nearly 6,000 people have obtained bonding qualifications through Yifa. Yifa Testing Center has passed the CNAS qualification and the testing qualification of important customers such as COMAC. Yifa relies on Germany's Fraunhofer IFAM, and after years of technology accumulation, it has developed in bonding simulation and calculation, adhesive selection, bonding process verification, bonding process evaluation, bonding failure analysis, bonded joint life prediction, bonding instead of welding, It has formed unique bonding R&D capabilities in the fields of EN17460/DIN6701-3, composite product development and trial production, and adhesive intelligent selection platform. Projects that have been served include carbon fiber cab projects, hood bonding projects, window bonding projects, big data simulation platform projects, cabin cover simulation projects, glass panel glue optimization projects, front window leakage failure analysis projects, etc. With an in-depth understanding of DIN6701-3 bonding design standards, Yifa has developed an industry-unique bonding material database that can realize simulation calculations of bonded joints with extremely high reliability.