On April 20th, 2013 in Shanghai, China, the world's leading commercial vehicle technology leader and first-tier supplier WABCO automotive control system debuted at the 15th Shanghai International Automobile Industry Exhibition 2013, to trucks, buses, Trailer manufacturers fully demonstrate their leading technologies and products in automotive safety, efficiency and environmental sustainability. At this auto show, WABCO will focus on high-end technologies including commercial vehicle braking, stabilization, suspension and transmission control systems, and innovative car vacuum pumps. Dr. Liu Liang, President of WABCO Asia Pacific, stated: "At the 2013 Shanghai Auto Show, our leading technology will make WABCO a unique benchmark for China and even Asia as a whole. The company will continue to gain in-depth understanding of the market and its strength. The combination of technological capabilities and local applications creates outstanding value for customers. WABCO will help automotive manufacturers in domestic and international markets through more than 1,500 local employees, a product development center and four world-class factories in China. Success." At the auto show, WABCO will highlight its latest two breakthrough technologies this year – WABCO's Adaptive Cruise Control (ACC) system technology and WABCO's first patented mono-piston air disc brake series Products MAXXTM22 and PANTM22. WABCO's adaptive cruise control (ACC) system technology can improve vehicle safety and driving efficiency by automatically adjusting vehicle speed to maintain a safe distance from the vehicle ahead. In the running state, once the distance between the driving vehicle and the preceding vehicle is less than the safe distance, the system will issue sound and visual warnings, and control the engine, and if necessary, partially brake. As early as 2011, WABCO took the lead in adopting ACC technology on commercial vehicles in the Chinese market. The WABCO MAXXTM22 Air Disc Brake is the lightest, best performing single-piston air disc brake in the range of heavy-duty trucks and passenger cars. This product not only improves the vehicle's fuel efficiency, increases the payload, but also reduces maintenance costs. WABCO also demonstrated the PANTM22 air disc brake series. The compact design and patented single piston technology of this series achieved superior braking performance in its class and significantly reduced the weight of various commercial models. The high customer satisfaction rate in the world also confirms the excellent road performance of this series of products. Other vehicle safety technologies displayed by WABCO at the 2013 Shanghai Auto Show include an advanced emergency braking system, OnGuardPLUSTM, which can warn and brake the driver in an emergency approaching a crash. It is used in the lanes of trucks and buses. Deviation warning system OnLaneTM, and WABCO's breakthrough ESCsmartTM, the industry-leading electronic stability control (ESC) technology, which can be applied to all braking platforms to adapt to changes in driving and load conditions, thereby reducing time-to-market Help automakers save time and labor costs. In order to meet manufacturers' and operators' increasing demand for more efficient and environmentally friendly commercial vehicles, WABCO also demonstrated other breakthrough technologies at this show. Including its award-winning OptiDriveTM automatic mechanical transmission control system, the system combines comfortable automatic transmission with highly efficient manual transmission, freeing the driver from the tedious operation of manual transmission while improving fuel efficiency; The e-compTM electric drive air compressor technology for hybrid system vehicle design can achieve a 35% fuel saving rate compared to conventional power driven cars. For the Chinese market, the mainstream diesel engine IV aftertreatment technology, WABCO has also introduced selective catalytic reduction (SCR) valve products. This innovative emission reduction product has improved the efficiency of the SCR system of the vehicle by adjusting the flow of coolant, reducing the emission of nitrogen oxides and better adapting to the latest regulatory requirements in China. It is reported that China's IV emissions standards for commercial vehicle pollutants will be formally effective in July 2013, the standard will promote more automotive platforms using SCR technology. In addition to a series of advanced technologies exhibited for trucks, buses and trailers, WABCO will demonstrate its differentiated advantages in the aftermarket, helping fleets and vehicle operators reduce operating costs while optimizing vehicle road values. WABCO offers a strong portfolio of innovative aftermarket products and value-added services, including professional technical training, system diagnostics, original product sales, and a worldwide network of aftermarket customer-authorized service centers.
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.xtccarbide.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.