In September, Dalian Huarui Heavy Industry Group Co., Ltd. (hereinafter referred to as Dalian heavy industry) welcomed a distinguished old friend. Li Keqiang, member of the Standing Committee of the Political Bureau of the Communist Party of China and Premier of the State Council, who inspected the company for the sixth time, came here to learn about industrial upgrading, entrepreneurship and innovation during the summer Davos forum. In Dalian heavy industry spring water development base, a 12 meter long and 237 ton silver gray 'big man' stopped the premier. When he learned that this is a marine crankshaft with a single crankshaft in the world, the premier took the initiative to pick up the roughness measuring instrument to measure this important quality index. He gripped the measuring instrument with both hands, close to the crank shaft, and his eyes focused on the digital display screen. The results are quickly displayed on the screen, 'ra0.33 microns! This is much lower than the delivery standard requirements of Ra0.8 microns'. Lang Xuegang, assistant general manager of Dalian Huarui marine crankshaft Co., Ltd. (hereinafter referred to as Dalian heavy industry crankshaft company), who accompanied the premier to measure, is still very excited about this scene. The prime minister is also very satisfied with this index and appreciates that this 'big man' is not only large in model, but also high in precision and advanced in technology

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Portable roughness measuring instrument to ensure the roughness quality of large crankshaft

Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. As a key component of marine engine, crankshaft is known as the 'heart' of marine diesel engine. Due to its heavy weight, high machining accuracy requirements and difficult manufacturing technology, the industry agrees that whether it has the manufacturing capacity of crankshaft represents a new level of shipbuilding industry to some extent. In recent years, Dalian heavy industry has reached the commanding height in the field of large-scale crankshaft manufacturing. It is an excellent enterprise in China and the fourth enterprise in the world to master the production technology of super large butt type crankshaft and have the manufacturing capacity of super long stroke crankshaft with a rotation diameter of more than 4.5 meters. It has achieved a major breakthrough in the localization research and development of super large and super large crankshaft, It provides an important support for China to move forward from a large shipbuilding country to a powerful shipbuilding country. Behind the 'Chinese innovation' of many major equipment technologies, it is Dalian heavy industry that has always attached great importance to accurate measurement and laid the foundation for high-quality products to go global. To accurately build 'China core' and promote China's economic development towards medium and high-end, the difficulty and breakthrough lies in the manufacturing industry. For the machinery manufacturing industry, accuracy is the foundation of quality. The production workshop and assembly site of Dalian heavy industry crankshaft company are familiar to Zhao Yan, director of the measurement Office of Dalian heavy industry operation Department. In the nine years of working in the measurement post, she can't remember how many days and nights she spent here. 'In the overall process of crankshaft development and production, the testing technology is closely combined with the production demand. Only by providing high-quality measurement and testing services can we solve the practical problems of production'. Since it is not allowed to replace the crankshaft during the ship cycle, there are high requirements for its accuracy.

Swiss SYLVAC outside micrometer with good stability

Level - Swiss Wyler level	Straightness tester - Swiss Kunz straightness tester

企业几何量长度自检溯源型设备-Trimos测长机	计量室高长度溯源基准-Trimos测长机
螺纹全尺寸测量首选设备-IAC螺纹综合测量仪	极大提高计量检测技术水平的-X射线断层扫描坐标测量机

　　Measuring crankshaft diameter with outside micrometer is an important measurement process in production. From 2009 to 2015, the measuring room planned, designed, evaluated and verified 12 crankshaft diameters with different specifications and measurement tolerances measured by external micrometer. When the original outside micrometer measures the shaft diameter with small tolerance, there is a great measurement risk after the evaluation of measurement uncertainty. Dalian heavy industry crankshaft branch purchased 41 sets of external micrometers with good stability, with a measurement range of (500 ~ 1300) mm and a division value of 0.01 mm, which are used for crankshaft diameter measurement. However, several different measurement results attracted Zhao Yan's attention. Is there a problem with such a high-precision measuring instrument? After several observations in the production workshop, it was found that the outside micrometer was originally placed in a special constant temperature chamber, which was taken out when it was to be measured, and then measured when it was placed at the same temperature as the crankshaft. However, due to the complex environment of the production workshop, large temperature difference and the length of waiting time will affect the measurement results. After finding the root of the problem, they made a shelf near the machined parts, placed the outer diameter micrometer on the shelf and kept the same temperature with the machined parts, reducing the measurement risk introduced by environmental factors. The measuring room also trained 13 processing and inspection personnel on the use and maintenance of the outer diameter micrometer, and conducted theoretical and practical operation examinations, which improved the qualification. The Swiss SYLVAC outside micrometer with good stability Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. In the process of crankshaft processing, the dissatisfaction with 'convex belly', 'concave center' and surface roughness gives everyone a headache. According to the analysis and research of the metrological personnel, it is caused by the tool collapse after the wide tool grinding of the crankshaft lathe. Therefore, the inspection wide tool mould is designed by ourselves, the problem of wide tool inspection is solved, the accurate data of wide tool angle is given, the 'old and difficult' of wide tool grinding is solved, and the machining accuracy of the crankshaft is guaranteed. Wide knife and other tool measuring instruments Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. There are many improvements like this in Dalian heavy industry. Zhao Yan told reporters that they adjusted the Measurement Confirmation interval of 29 large range dial indicators with measurement range (0 ~ 30) mm, from one year to four months. In order to measure the radial runout of the crankshaft, a (100 ~ 500) mm crankshaft gauge is equipped to monitor the opening and closing shaking amplitude of the crank. In the absence of crankshaft gauge testing standard, I have prepared crankshaft gauge calibration method as an enterprise standard to meet the traceability requirements of crankshaft gauge. 'We pressurize ourselves and do it more carefully in order to obtain more accurate measurement data. Various Swiss SYLVAC scales with high stability and accuracy. Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. According to the production demand, Dalian heavy industry has equipped 605 measuring equipment for crankshaft. According to Lang Xuegang, assistant general manager of Dalian heavy industry crankshaft company, this is true These devices not only can measure accurately, but also are important weights to win customers. Once, a Korean customer visited the factory. Originally worried about product quality, he immediately dispelled his doubts after seeing the global saddle level and wet film thickness measuring wheel used by Dalian heavy industry. The world's advanced level - Swiss Wyler level - the world's advanced straightness tester - Swiss Kunz straightness measuring instrument - Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. In order to make our products go global, in addition to accurate instruments, we also need a global 'pass'. In Dalian heavy industry, the president authorized the vice president in charge as the management representative to establish and effectively operate the company's measurement management system and laboratory quality management system in accordance with iso10012:2003 measurement management system - Requirements for measurement process and measurement equipment and ISO / IEC17025:2005 General requirements for the ability of testing and calibration laboratories. On December 31, 2011, the testing / Calibration Laboratory of Dalian heavy industry was approved by China National Accreditation Service for conformity assessment (CNAs). The re evaluation in December 2014 proved that the laboratory has the technical ability to provide customers with 39 testing items and 59 calibration items. This indicates that the management level and testing / calibration ability of the laboratory have reached the global level, and the test data have been recognized by more than 100 institutions. This has not only improved the quality level of the company, but also played an important role in Dalian heavy industry's competition for the global market. According to Zhao Yan, at present, they have a team of 44 high-quality metrological verifiers. After the quality supervision department has established 31 enterprise high measurement standards, the self inspection rate of more than 25000 measuring equipment of the company has reached 96%. High measurement standard devices that cannot be self checked and need to be traced will be sent to Dalian Institute of measurement and testing. 'It can be said that our two families are friends of close cooperation. Dalian Institute has put forward valuable suggestions on the establishment of enterprise high measurement standard devices and the use and maintenance of equipment. The verification / calibration service is also thoughtful and timely. For the traceability needs we put forward, we can ensure that the traceability unit can support the enterprise to improve the technical level and ability of measurement and detection.' Enterprise geometric length self inspection and traceability equipment - trimos length measuring machine measurement room global high length traceability benchmark - trimos length measuring machine Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. Thread full-size measuring equipment - IAC thread comprehensive measuring instrument greatly improves the - X-ray of measurement and detection technology level Linear tomography coordinate measuring machine Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. Dalian Huarui heavy industry group improves the global competitiveness of products through accurate measurement. Zhao Lin, President of Dalian Institute of Metrology and testing, told reporters that Dalian heavy industry is their major service customer. The two companies will sign a service agreement every year, and the verification fee can be paid quarterly, And give a certain discount to provide convenience for enterprises. 'Equipment manufacturing industry is an advantageous industry in Dalian. In the current transformation and upgrading, it is inseparable from the guarantee and support of measurement.' In the face of fierce competition, Dalian heavy industry is implementing five strategies: new product R & D strategy, global operation strategy, industrial chain extension strategy, traditional leading product upgrading strategy and core parts strategy. 'At present, the global shipbuilding industry is still in the process of transformation and upgrading. Despite the pressure, our product advantages of large model, high precision and advanced technology are becoming more and more prominent. We are confident to go global!' Han long, Minister of corporate culture of Dalian heavy industry, spoke loudly.