Xiamen will invest RMB 1 billion to build "R&D center for vehicles and construction machinery"
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
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In the future, passenger cars, commercial vehicles, and special vehicles for large-scale machinery produced in Xiamen will be better and more secure in all aspects. The reporter learned yesterday that Xiamen will invest 1 billion yuan to build a "vehicle and engineering machinery research and development center" that integrates product development, technology incubation and application training. The R&D center is located in the Jimei Machinery Industry Concentration Zone and will be the most advanced and largest technology in this field in China.
Investment costs up to 1 billion yuan
Yesterday afternoon, the review and appraisal of the “Xiamen Vehicle and Construction Machinery R&D Center†construction program was held in Xiamen Hotel. Many well-known academicians and practitioners from across the country gathered in Xiamen to discuss the construction of R&D centers. According to the plan, the “R&D Center for Vehicles and Construction Machinery†in Xiamen will be completed in five years, with an estimated investment of up to 1 billion yuan. The R&D center will set up a public technology R&D platform with 13 technical research centers. In addition to the technology platform, the R&D center will also vigorously build a platform for production, research and development, and plans to join hands with universities such as Xiamen University, Jimei University, Xiamen University of Technology, Huaqiao University, and Fuzhou University to develop talents by co-constructing and applying basic laboratories. And common technology research and development work. In addition, the R&D center intends to build a non-profit international level motor vehicle inspection agency that will provide testing services for related companies in the region.
After completion, the R&D center will mainly provide passenger vehicles, commercial vehicles, and special vehicles for large-scale machinery, and provide complete chain services such as matching of entire vehicles, appearance design, safety inspection, and hydraulic noise reduction. At the same time, it will also start with aspects such as environmental protection, energy conservation and artificial intelligence, explore new core technologies, and develop new products that will lead future trends.
Will be implemented in two phases
According to the plan, the “Xiamen Vehicle and Construction Machinery R&D Center†will be implemented in two phases. Among them, the first phase of construction will be started in 2008 and completed in 2010. It is estimated that 600 million yuan will be invested. The goal is to build the R&D center into a national-level automobile manufacturing R&D center focusing on R&D and manufacturing passenger cars and commercial vehicles, as well as research and development of manufacturing vehicles. The main construction machinery research and development center.
The second phase of the project will start in 2011 and be completed in 2012. It is estimated that 400 million yuan will be invested. The goal is to build an international, open mechanical manufacturing technology research and development center with an international R&D standard in Xiamen and to create the largest in the world in Xiamen. Bus R&D and production base.
Experts speak out R&D center has great strategic significance
Guo Konghui (Academician of the Chinese Academy of Engineering, Director of the State Key Laboratory of Automotive Dynamic Simulation, Dean of the Automotive Engineering College):
To build such a R&D center for vehicles and construction machinery, the Xiamen City Government should say that it has also prepared a relatively large investment in funding. This measure is very strategic. Today, our experts all feel that the Xiamen City Government not only saw the immediate development, but also set its sights on the future.
Although the development of Xiamen Jinlong Automobile is quite good, Xiagong is also developing well. However, in general, our technological development does not have its own core technology compared with foreign countries. Future developments may also encounter various problems. We have a slight advantage in competition with foreign countries. We are developing faster because we have lower labor costs. However, labor costs will gradually change. If we do not have higher technology than others after we finish it, we will be hard to compete in the market.
Therefore, we now set up an R&D center, which has great strategic significance for the future development and for the development of the entire vehicle engineering and construction machinery.
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.