Second, IIM-130B sprinkle a red car
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
Outline drawing of IIM-130B Sprinkler (without sweeping device). The basic vehicle is the 3HJ1-130 chassis. The working device includes: water tank, mesh filter, main valve, water pump, and pipe with two nozzles. Road system. In winter, the plow can be installed on the car. When the sprinkler works, some of the power is transmitted from the engine via the transmission to the driving system to drive the vehicle to travel. In addition, part of the power is transferred to the pump through the transfer case.
When the sprinkler is in the transport state, the transfer case handle is in neutral and the pump does not work. When the sprinkler sprinkles water, the water pump absorbs water from the water tank, and the pressure water is sent to the sprinkler behind the vehicle through pipelines and valves. One way to add water to a water tank by a sprinkler is to fill it directly with a fire faucet. Another method is to use a water pump to pump water from the pool.
Sprinkler pipe connection principle. The pump 4 can be used for adding water to a water tank or as a water pump. When the water is added to the water tank, the valve 12 closes and the valves 10, 11 open. The pump absorbs water from the suction port 13, and sends the water to the water tank 1 through the valve 11. During the watering operation, the valves 10, 11 are closed and the valves 12, 5 are opened. The pump pressurizes the water in the tank and sends the sprinkler 7 and 90 behind the vehicle through the pipe. The water level of the tank is indicated by the level sensing element 2. At the end of the sprinkling operation, the water in the water tank is drained through the drain valve 14 . Throttle valve 5 is used to adjust the flow of the spray water, thereby adjusting the amount of water spray and the width of the spray.
â–².Power take-off
Sprinkler power take-off consists of box, gear, bearing, spline shaft and accessories. The double gear of the power takeoff is driven by the four gears of the main transmission of the automobile, and the power is transmitted to the output shaft and then the water pump is driven by the transmission system.
â–². Water tank
Sprinkler tanks are cylindrical tanks, which consist of tanks, brackets, and tank lids. The tank top diameter of the tank is 450mm, and the tank compartment structure divides the tank into three single tanks, and water circulates through the semicircular hole at the bottom of the diaphragm. There is a 50 nun drain pipe at the bottom of the tank body, and there are 2 vent holes with a diameter of 20 mm on the tank cover.
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.