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.xtclasercladding.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.
The most important part of the refrigerator is the number of compressors. If you don't have a compressor with excellent quality and technology, it is not a good refrigerator. However, many netizens have recently reported that they often hear the noise from the refrigerator at home, but on the surface, they can't see where there is something wrong. Today, Xiaobian will come to popularize the daily abnormalities of how we can tell the refrigerator compressor.
In fact, the structure of household refrigerator products is not complicated, and generally consists of an important part of a compressor, a condenser, a drying filter, a capillary tube, and an evaporator. As the most complicated mechanical component, the compressor is naturally in the most important position, and it is also the most technically advanced component in the refrigerator. Under normal circumstances, the compressor has a great influence on factors such as cooling efficiency and noise.
However, while paying attention to the quality of the compressor, the material usage and workmanship of the condenser, evaporator and connecting pipe are also important reasons for the quality of the refrigerator. In most cases, the compressor failure rate is much smaller than that of these parts. malfunction.
Under normal circumstances, the sound of the "squeaky" sound from the refrigerator in the operation of the refrigerator, together with the sound of the rapids, is a softer normal noise.
The sound of the "beep" from the refrigerator is a kind of sound caused by the thermal expansion and contraction in the box, which is normal.
The "Dangdang" sound that appears in the refrigerator is often generated at the moment when the compressor starts or stops. Sometimes, sometimes, two or three times, this will not affect its normal use.
The sound of the refrigerator is sounded. If there is a collision sound of the "ping-pong" metal tube vibration in the refrigerator compressor, this is the sound of the high-voltage noise-reducing pipe and should be repaired in time.
If the refrigerator has a "bang" sound, and the sound is emitted in the operating refrigerator compressor, this is the sound of the compressor spring broken or dislocated, and should be repaired in time.
The sound of "giggle" or "squeaky" appearing in the refrigerator, accompanied by obvious vibration of the compressor, is that the mechanical parts of the compressor are damaged or loose, so that the impact occurs and should be repaired in time.
The sound of the "squeaky" sound from the refrigerator is the sound of the oil blowing sound from the refrigerating machine oil entering the evaporator too much, and should be repaired in time.