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.hvofpowders.com
Today, automotive e-commerce is nothing new. Not only has car e-commerce developed in full swing, more and more auto parts companies have also joined the e-commerce army and seized the new market of online sales. In this year's "Double 11", e-commerce sites such as Tmall, Jingdong and Yihaodian have launched auto parts promotions and attracted a large number of consumers to participate in this "shopping spree". The sales data obtained by e-commerce companies is very high. considerable.
Before that, the reporter had done a survey on the e-commerce model of auto parts. Experts believe that due to the uniqueness of auto parts and the current status of the auto parts circulation market, the conditions for the development of parts and e-commerce are still not mature, and the road ahead is still very long. However, irrespective of the ups and downs of auto parts and electronics suppliers, only from the sales volume of the “double 11†e-commerce favorite parts and components, it seems that we can see the hope of the future development of parts and components e-commerce.
Parts e-commerce sales data show "blowout"
As of the early morning of November 12, the Alipay data broadcast room's Alipay transaction data was fixed at 35 billion yuan, an increase of 83% from last year's 19.1 billion. Open Taobao auto supplies column, including automotive parts, automotive electronics and automotive decoration and many other projects. The reporter interviewed several auto parts sellers through Ali Wangwang. Tmall, a shop owner of auto accessories stores, told reporters that “Double Eleven†orders exceeded 50,000 orders, an increase of 60% compared with last year. The sales of blowout-type growth are mainly related to the discounted items, discounts, and free shipping items offered by merchants.
According to data from the official website of Lu Cheuk Technology, on November 12th, Lu Chang Technology Tmall’s “Double Eleven†sales successfully exceeded 4 million, creating a sales record of 4.342 million yuan, successfully achieving the day of the Tmall “Double 11†DVD. The first place in the navigation industry sales. In addition, on November 5-11, the click-through rate of Tmall DVD navigation increased by 27.37%. Comprehensive statistics of the Tmall Category Week, the reporter found that on November 10, the total number of goods sold was 1.299 million, and on November 11 the volume reached 4.075 million, which almost quadrupled.
The Bosch Group established the official Bosch auto parts flagship store in Tmall in 2012 to provide users with Bosch auto parts products with reasonable prices and excellent quality. The reporter interviewed the after-sales staff of the flagship store about the sales volume of the “Double 11†product. He told reporters that from November 12 to 20, almost all the staff were busy with the order for “double 11†shipments. . Although the sales data can only be counted after 20 days, it can be seen from its busyness that it has a good sales performance.
Of course, there are also some sites that offer wider benefits. The reporter learned from the customer support service provided by Shanghai Wushenwu.com. In just one year after launching a self-service maintenance service for private owners on the website, only the owners of the Shanghai area used self-service maintenance to reach more than 100,000 trips, and the number of registered users exceeded 300,000. The customer service staff also told reporters that the "Double 11" campaign lasted from November 11 to November 17, which virtually allowed more owners to enjoy preferential measures. Although it is not like other e-commerce companies to play a 50% discount in the audience, but the reporter observed that some products have 30% discount, but some products exceed 50% discount. Thanks to this, the volume of product orders increased by 5 times compared to usual.
Data is a fact. With considerable sales figures, we can see that there is a lot of room for the development of auto parts and electronics suppliers in the future.
Parts and components suppliers need multi-mode collaborative development
At present, most auto parts companies have already involved in e-commerce. Some companies use Tmall, Jingdong and other e-commerce platforms to develop e-commerce, such as Bosch, Sophie, Bridgestone, etc., have all set up official flagship stores on Tmall; while others use specialized auto parts network platform to develop , Such as auto parts network, car worry-free network, etc.; there are some parts companies are ready to establish their own e-commerce website to develop.
The e-commerce of auto parts and components is a trend in the future. There are many manufacturers involved and the data is gratifying, but there are still hidden concerns. At present, the domestic auto parts market is still not standardized, coupled with the limitations of e-commerce, it is easy to cause many black-hearted businesses to use fakes, defective products to deceive consumers. As previously learned during an interview with reporters, the development of parts and components e-commerce needs industry self-discipline, the improvement of relevant rules and regulations, and industry standards, as well as the informatization of the industry and the improvement of people's quality.
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.