The micro-vehicle boss SAIC-GM-Wuling has never faced tremendous pressure and the same huge opportunities. In 2011, SAIC-GM-Wuling launched its first independent brand passenger car, Baojun 630, and entered the Indian market at the same time, forming a new development pattern for commercial vehicles, passenger vehicles and overseas operations. However, market adjustments, especially the arrival of negative growth in micro-vehicles, have made Wuling's expansion plan full of risks. The micro-vehicle boss has actually stood on the edge of the cliff, and its strain and breakthrough has become the focus of attention in the industry. Recently, SAIC-GM-Wuling launched the "combination boxing".
Wuling Hongguang Anti-Skilder
According to the data released by the China Automobile Association, the crossover passenger car decreased by 6.82% and 6.73% year-on-year in the first four months of 2011, becoming the only decline in passenger cars. In April, sales of SAIC-GM-Wuling fell to third place by Shanghai Volkswagen and Shanghai GM. After the debut of the Shanghai Auto Show in 2011, SAIC-GM-Wuling decided to continue to improve the interior quality of the Baojun 630 and the quality of the entire vehicle, and was not eager to bring it to market. In fact, Wuling has placed its focus on resolving market pressure on Wuling Hongguang who has not entered the core of public opinion. This product targeting compact commercial vehicles is the vanguard of Wuling's business-to-business venture, but it still relies on the micro-customer system to tap the potential of production-based consumption.
Wuling Hongguang’s monthly sales have already approached 20,000 units, becoming Wuling’s anti-slider. From January to April 2011, Wuling’s market share was 40.1%, which was a 2.6% drop from 2010. However, Wuling’s share still reached 42.8%, which was the same as in 2010, when Wuling Hongguang was included.
Expand rural network coverage
Firmly taking advantage of business, establishing an export model that focuses on product output, management team output, and business model output, this is the “combination boxing†that SAIC-GM-Wulings resolved to expand strongly in the weak market. However, Wuling also emphasized that the core of the combined boxing is the improvement of the competitiveness of the entire system, which is also the core of the current car companies' competition.
At the team level, SAIC-GM-Wuling’s "combination boxing" will stimulate the creativity of its employees, especially the outstanding young employees. At the operational level, it will further promote the integration of commercial vehicle platforms, platform differentiation, and platform utilization. The internationalization of the three major platform development strategies will enhance product quality and build a strong competitive product portfolio. At the market level, in 2011, it will continue to accelerate the construction of marketing and service networks and further expand the network coverage rate for the rural market. At the user level, New initiatives such as public welfare marketing were launched to increase support for entrepreneurs in cities and townships to become entrepreneurs.
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:
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.
Tungsten carbide roller material design
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.
Tungsten carbide roller category
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 roller production process control
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.
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