Traditional lighting giant introduces new LED light source

It is understood that governments have actively formulated environmental regulations to prohibit the use of incandescent lamps. Traditional lighting giants have introduced new LED light sources to accelerate the formation of new business models. Since the global lighting power consumption is higher than the total electricity consumption of 20 in the whole year, up to 90 of the electric energy is converted into heat energy consumption, which is very economical. Under the consideration of environmental protection and energy saving, LED lighting has quickly become a technology of great interest. And industry. At the same time, governments of various countries have actively formulated environmental protection regulations. Under the stimulation of the dual interests of the market and regulations, the scale of the global LED industry is growing rapidly. The advantages of LED lighting are self-evident. LED lamps have high luminous efficiency and long life, and their luminous efficiency can reach 2.5 times that of fluorescent lamps and 13 times that of incandescent lamps. The luminous efficiency of incandescent lamps is very low, only 5 of the electrical energy is converted into light energy, and 95 of the electrical energy is turned into heat. Fluorescent lamps are better than incandescent lamps. 20 to 25 of the electrical energy is converted into light energy, but 75 to 80 of the electrical energy is wasted. Therefore, from the perspective of energy utilization efficiency, the utilization efficiency of these two light sources is very low. Therefore, the benefits of LED lighting are obvious. In 2007, Australia introduced the first ban on the use of incandescent lamps, and the European Union passed regulations on the elimination of incandescent lamps in March 2009. Therefore, the two international traditional lighting companies Osram and Philips have accelerated their layout in the field of LED lighting in recent years. Their entry has promoted the rapid development of the LED lighting market, while also accelerating the pace of LED technology advancement. With the rapid development of the LED industry in the field of lighting, traditional lighting giants hope to make lighting products more innovative by introducing new light source designs. Therefore, LED lighting and traditional lighting are gradually merging into one, accelerating the formation of a new lighting business model, which is very conducive to the rapid promotion of LED lighting.

Tungsten Carbide Roller

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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