On the afternoon of March 23, 2012, Comrade Jia Qinglin , Member of the Standing Committee of the Political Bureau of the CPC Central Committee and Chairman of the National Committee of the Chinese People's Political Consultative Conference, Jiang Yikang, Secretary of the Shandong Provincial CPC Committee and Chairman of the Standing Committee of the Provincial People's Congress, Jiang Daming, Deputy Secretary of the Provincial Party Committee, Deputy Secretary of the Provincial Party Committee, and Provincial CPPCC Chairman Liu Wei, accompanied by the leaders of Weifang City Party Committee and the Municipal Government, came to Weichai to conduct research on the implementation of the spirit of the “two sessions†and the promotion of sound and rapid economic development. During the inspection process, Jia Qinglin pointed out: We must build ambitions in all walks of life, like Weichai, and strive to be the world's best. At 3 pm, Jia Qinglin and his party arrived at the Science and Technology Pavilion of the Weichai Power High-tech Park. In the car, Chairman Jia tightly grasped the hand of Chairman Tan Xuguang and said: After 9 years, I came here again and I saw a brand new chopping wood! Chairman Tan Xuguang said: Weichai 50,000 employees have been expecting your arrival. Jia Qinglin visited Weichai In the Science and Technology Pavilion, Chairman Tan Xuguang reported to Jia Qinglin on the development of Weichai. From the perspectives of growing up from weak to strong, Weichai nodded, and asked questions from time to time to learn about various types of products. Performance, use, and market conditions. When the Weichai Lanqing engine reached the world advanced level, he smiled and said to the accompanying leaders: Seeing that the Chinese have more ambition, the engine is the heart of the machinery and equipment. In the past, it was our weak link. The key technologies were controlled by foreigners. in. Now we have made a breakthrough for Weichai people and changed our history of relying on foreign “heartsâ€. It is very good! When he heard that Weichai had developed from a single engine supplier into a full-series, all-round equipment manufacturing group, Jia Qinglin was very happy. He said that I came to Weichai 9 years ago to see the old factory area and it was only a diesel engine production. plant. Looking at today, not only has there been a leap in the scale and level of equipment manufacturing, but it has also become a large enterprise group spanning the three countries and seven regions. Chinese companies should have such a discouragement. With such a spirit, we can realize the progress made by China's manufacturing to China. Prior to the powertrain exhibition, Jia Qinglin was pleased to pose for a picture with the company's leaders such as Tan Xuguang. Jia Qinglin visited Weichai Optimizing the industrial structure, transforming the mode of economic growth, and enhancing the ability of independent innovation are the main guiding principles of the Party Central Committee in recent years. In the past two years, a series of policies of the Central Government have been vigorously implemented in Weichai. When we heard that Weichai had just acquired the Italian Ferretti Group, a world-famous yacht company, Jia Qinglin stood in front of the yacht model for a long time to learn more about the company and the M&A process, and highly praised Weichai's internationalization strategy. Three important directives, he pointed out: First, our country proposes to become an innovative country by 2020, and the criterion for an innovative country is to be the top 15 in the industry. We must build ambitions in all walks of life. Like Weichai, we must strive to be the best in the world. Second, we must be a century-old shop. Weichai has been cultivating deeply in the diesel engine industry for many years and has achieved remarkable achievements and played an exemplary role. We hope that you shoulder the important responsibility of revitalizing China's equipment manufacturing industry and take the lead in the industry. Third, the engine is the weakest place in our country. The country has set up a special engine, and you have to take responsibility for it. To achieve the world's leading technical indicators and environmental indicators, and to contribute to China’s construction of an innovative country in your industry. It is to achieve the world's first commanding height. Chairman Jia Qinglin’s remarks won warm applause from the audience. Jia Qinglin visited Weichai After the inspection of the Science and Technology Pavilion, Jia Qinglin went to No. 2 factory again. Chairman Tan Xuguang introduced to Jia Jia. This is the production base of Lanqing high-power engine and has the world's advanced equipment manufacturing level. Chairman Jia nodded his head and expressed his eagerness to check each station. On the assembly line, he carefully visited the process and talked with the staff graciously. He asked with concern about product quality and market issues. "How much is the beat? How much is the output? How much is the emission?" After a satisfactory answer, Jia Qinglin said, "We just want to continuously improve the R & D and manufacturing level of the equipment manufacturing industry. You must continuously improve your own design and development capabilities and build your own brand." ." In the workshop, Chairman Jia came to the first-line employee team event area. Chairman Tan Xuguang pointed to the computer and told Chairman Jia that the Chairman’s blog narrowed the distance between the management team and the employees and realized the openness of the factory affairs, disclosure of the party affairs, and democratic supervision. Sunlight makes it easier to listen to employees' opinions. Jia Qinglin praised that this method is good! We have always emphasized the importance of creating superiority. For companies, the premise for creating excellence is to mobilize the enthusiasm of all employees and bring everyone together. In this regard, Weichai apparently walks ahead. At the end of the inspection, Chairman Jia Qinglin grasped the hand of Chairman Tan Xuguang and said: You are a famous entrepreneur and a pride in China's equipment manufacturing industry! I encouraged you with one sentence from the party building work: I will strive for excellence. I hope that you will extend this spirit to products. After 9 years, I will come to pick firewood again and I hope to see a new and better and better firewood. At the gate of Factory No. 2, Jia Qinglin and Weichai’s leading members shook hands and bid farewell. He encouraged Weichai to continue its efforts to go further and further on the road of independent innovation and make greater contributions to building an innovative country.
Tungsten carbide roller has characteristics of good wear resistance, high temperature red hardness, thermal fatigue resistance and thermal conductivity and high strength , have been widely used in high-speed wire rod, bar, rebar, seamless steel tubes, etc. Domestic production of tungsten carbide roller materials mostly WC- Co, WC- Co- Ni- Cr two series, and the content of Co, Co- Ni - Cr is in the range of 6wt% ~ 30wt%. From the use of perspective, tungsten carbide rollers has good mechanical properties, its flexural strength up to 2200 MPa or more, shock toughness up (4 ~ 6) × 10^6 J/ m^2, Rockwell hardness (HRA) is up to 78 to 90, widely in the high-speed wire rod rolling process, which is much higher than single-slot chilled cast steel or high speed steel rolls.Tungsten carbide is made of Tungsten Carbide Powder and binder phase (such as drilling, nickel, etc.), and then pressing and sintering, regardless of the conditions under cold rolled or hot rolled has excellent wear resistance, tungsten carbide rollers has been widely used in pre-finishing mill and finishing of high-speed wire rod currently. On the performance of tungsten carbide roller in hot-rolling wire rod , the material must meet the following requirements:
Tungsten carbide roller material design
Tungsten carbide roller category
Tungsten carbide roller production process control Carbide Roller,Carbide Ring,Mill of Rolling Line,Steel Wire Rod,Mill Rolling Finish Stand,Mill Roller Groove Type Luoyang Golden Egret Geotools Co., Ltd , https://www.egretgeotools.com
1. Sufficient anti-fracture strength;
2. Good abrasion resistance;
3. The smooth surface finish;
4. Excellent corrosion resistance, thermal fatigue, thermal cracking performance.
Tungsten carbide roller rings can working in bad conditions , small profile rolling (especially rebar rolling) process conditions is harsher than the high-speed wire rod, and therefore corresponds to the profile rolling ,tungsten carbide rollers recommend using high binder phase carbide.
Pre-finishing all vehicles roller should ensure its high toughness, strength, rigidity and thermal conductivity, followed before considering its wear resistance. When designing each vehicles roller, pre-finishing materials should choose carbide grades of Co, Co- Ni- Cr binder content is high (greater than or equal to 25wt%) , requiring an average WC grain size of coarse (5μm ~ 6μm), to obtain a higher shock toughness, proper strength and hardness. For the finishing of the roller movements, particularly the last two rollers of the finish rolling, which suffered load is small, and high relative velocity of the material to be pressed (80 m / min ~ 120 m / min). In this case, the wear resistance of the roller to be the most important requirements, and must ensure the strength , timpact toughness and hardness of a reasonable match, so the binder of Co / Ni content ratio and the average grain WC control of particle size and other factors must have greater control in front of different pre-finishing rolling roll.
According to the structure of tungsten carbide rollers, it can be divided into solid tungsten carbide roller and composite tungsten carbide roller. Solid tungsten carbide rollers have been widely used in pre-finishing and finishing stands high speed wire rod mill (including fixed reducing the rack, pinch roller rack). Composite tungsten carbide roller is made of cemented carbide and other materials, and it can be divided into tungsten carbide composite roll rings and solid tungsten carbide composite roller. Tungsten carbide composite roll rings mounted on the roller shaft; solid tungsten carbide composite roller will be directly cast in the roll axis to form a whole, a large load is applied to the rolling mill.
Tungsten carbide rollers produced by powder metallurgy method, the key to its process control is the chemical composition of the material and the mixture was prepared, pressed molding, sintering and deep processing and other preparation process parameters.
1. Preparation of starting material (WC focus quality): As the WC raw material and quality control of the use of different levels of quality may fluctuate, resulting in adverse effects on microstructure.
2. Preparation of the mixture: Mixture preparation is the key to the production process of the roller, the roller of failure modes - trachoma, mainly generated by this procedure.
3. Pressing: roller pressing is an important process of the roller mill.
4. Sintering: roller sintering is to determine the final quality of the roller production processes, use of advanced low-pressure sintering technology, HIP sintering technology can greatly improve the performance of roller.
5. Deep processing: deep processing rollers have a greater impact on the quality and accuracy of the roller surface.
Nine years later, I would like to look back and Jia Qinglin praises and praises the new firewood