As the "heart" of the car, the importance of the engine is self-evident. When a car's engine frequently suffers from various problems, it will not only seriously affect the car's performance, but also the money needed to repair it at a garage repair shop is staggering! According to data from a domestic authoritative automobile quality complaints website, the following Cheyu World has collated the five major brands with serious complaints about engine quality in 2018 (as of May 28), so as to provide reference for everyone when buying a car. Magic speed S3 NO.4 BAIC The BAIC Group has recently been a lot of problems. It has just been revealed that it has filed a recall plan with the State General Administration of Market Supervision. It is expected that some E-Class vehicles will be recalled; here, BAIC Yinxiang’s models will be “topped up†in the TOP10 engine quality complaints for their own brands. According to data from a certain authoritative automobile quality complaints website in China, BAIC Yinxiang Magic Speed ​​S3 ranks 10th in the engine quality complaint list of self-owned brands in 2018 (as of May 28, the same below). The engine problems complained by the owners are mainly concentrated. In: engine oil leakage, oil leakage, engine cooling failure, noise and other aspects. NO.3 Cheetah CS10 Cheetah car sales are not good, but they are often seen on the quality complaints list. According to public statistics, as of now, the average monthly sales of Cheetah CS102018 was only over 4,000 vehicles, but according to data from a domestic authoritative vehicle quality complaints website, it ranked sixth in the list of engine quality complaints for its own-brand vehicles. The engine problems complained by the owners are mainly concentrated on engine noise, engine power shortage, easy engine extinguishing, engine oil leakage, noise, engine jitter, and inability to start. NO.2 Haval H2, Haval H6, Haval M6 As one of the leading brands of self-owned brands, Great Wall Motor has had some sluggish growth in recent years: Its sales are too dependent on "explosive models" - the Haval H6, but now they are tired and have been weak; they want to attack the high-end market with VV7 etc. However, there are some who are not able to do so; in fact, it is fundamental or whether the product can not keep up. According to data from a domestic authoritative automobile quality complaints website, Harvard H2, Haval H6, Haval M6 and other 3 models of Great Wall Motors have “topped†their own-brand automobile engine quality complaints list TOP10, ranking 9th, 5th, and 2nd respectively. The name of the engine that the owners complained about mainly focused on engine jitter and abnormal noise, and engine oil leakage. NO.1 Changan Automobile, on behalf of models: Changan CS75 If we say that in 2018 Changan Automobile has left behind other car companies far behind, then its Changan CS75 has been complained. According to data from a domestic authoritative automobile quality complaints website, Changan CS75 ranks first in the auto engine quality complaints list of its own brand in 2018, and has received 2,801 complaints, almost equal to the Dongfeng Honda CR-V, the protagonist of the “accelerator†incident. 1 times higher! The engine problems complained by owners are mainly concentrated on: engine oil increase, engine exhaust failure, and high fuel consumption. The above is the sharing of Che Yu World today. If you have any questions, please feel free to leave a message or inquire below the article. We will reply in the first time. Disclaimer: This article is written by the knife-writer of Cheyu World Operations, reviewed by Ling Qing/Liu Shuai, Che Yu World Original Copyright. Some of the pictures are from the internet. We thank the original photographer here. Reprint please specify the source and author, if any infringement, Che Yu World and founder retained the right to pursue. Cars, you come to Che Yu world, your exclusive choice.
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.