In the daily maintenance of the vehicle, the old driver of the aerial work vehicle has accumulated the following experience, and now share with the majority of driver friends: When a truck is blocked at multiple lanes, it should be slowly accelerated and quickly braked in order to avoid rear-end collision. Do not see the front vehicle quickly and follow it. Otherwise, the rear vehicle may catch up quickly. Accelerated start, the rear car will slow down, and the brake must be fast, otherwise it is easy to hit the front car. The service life of high-altitude trucks is 8 years. It is best to replace them within 5 years. In less than three years, the number of car problems will increase, and the cost of maintenance will be enormous. This is not as good as buying new cars in time. This is the same for buying a used car. It is best not to buy used high-altitude vehicles that have been used for 5 to 6 years. Otherwise, there will be a lot of car problems. It's better not to listen to the radio for more than half an hour while parking, otherwise it will easily lead to loss of battery for overhead vehicles. As the battery is driven by the engine, it can not be charged continuously. If you listen to the radio for a long time, it will lead to battery loss. Electricity is too fast and it hurts the battery. It is not necessary to frequently maintain and maintain aerial work vehicles. According to many years of experience, as long as the car can continue to run smoothly, there will not be too many hidden dangers. It will not affect the driving problem and it will not be easy to repair or replace the accessories. Otherwise, once you Because a minor problem has been repaired at the repair station, you may have set up a home with the repair station. Unless the car has aged to the repair and maintenance.
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.xtcwelding.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.
High-speed aerial vehicles do not necessarily have to pay for high speed
Many high-altitude truck drivers feel that they must speed up or slam their brakes. This is not the case. It depends on different road conditions. When the road conditions are good, it should be accelerated as quickly as possible so as to enter the constant speed as soon as possible. If it is still accelerating slowly, Keeping the engine at a low speed for a long time is not only more costly, it is also more detrimental to the engine. Also, it should be quick and thorough when braking. Do not step on it a little, otherwise it will easily wear out the brake pads.