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.xtcmetalpowder.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.
· Porsche 918 front / rear axle connection axle hidden danger 4S shop will be recalled
The 918 Spyder is a super sports car from Porsche that was introduced to the country in an imported way. Netcom has learned from the AQSIQ Defective Product Management Center that the front/rear bridge connecting the longitudinal and lateral control arms of the 918 Spyder is susceptible to stress corrosion, which may cause cracks and gradually break the part, posing a safety hazard. This time, a total of 30 vehicles were affected.
Porsche 918 front/rear axle connection axle hidden danger 4S shop will be recalled
Brand Model Quantity (unit) Production date/year the reason
Porsche 918 Spyder 30 June 23 to November 24, 2014 Front/rear bridge connection axis hidden danger
Tabulation: Netcom Internet Info Agency
This time, Porsche (China) Automobile Sales Co., Ltd. recalled the 2015 Porsche 918 Spyder, which was produced from June 23, 2014 to November 24, 2014. According to the company's statistics, there are 30 vehicles in mainland China.
For the vehicles within the scope of this recall, the connecting shafts of the front and rear axles and the connecting shafts of the lateral control arms are susceptible to stress corrosion, which may cause cracks and gradually cause the component to break. In some cases (such as driving on a track), the handling performance of the vehicle may be affected to increase the risk of collision and pose a safety hazard.
For the information related to this recall, Netcom has called the official 400 service hotline of Porsche (China) Customer Service Center as a consumer and consulted. The other party said: The manufacturer has received a recall notice, and the recall of some models will start on June 25. At the same time, you can also call the official customer service hotline and provide the frame number of the vehicle to confirm whether the vehicle is involved in the recall.
Netcom also consulted authorized dealers to inquire about the implementation of the vehicle recall plan. Some customer service personnel said that the current recall notice, we are about to implement, there are solutions to potential safety hazards, Porsche (China) Automobile Sales Co., Ltd. will replace the parts involved for the vehicles within the scope of the recall free of charge. It is recommended that users of the 918 Spyder car do not drive the vehicle to participate in any track activity until the recall is completed.