With the improvement of energy-saving and emission-reduction standards, the requirements for modularization and lighter weight of auto parts have become higher and higher. Pumps and oil pumps have become an integral part of internal combustion engines, and companies have also begun to increase their technological development, production processes, and corporate management. In order to synchronize the development of internal combustion engine companies.
Recently, the working meeting of the cooling oil pump oil pump sub-committee of China Internal Combustion Engine Industry Association was held in Beijing in 2014. Experts from the industry and managers of water pump and oil pump companies discussed the issues.
â– Pump oil pumps are facing technological innovation Today's energy-saving and emission reduction of internal combustion engines requires the improvement of the technology and quality of internal combustion engines and related components. For example, Fu Yuwu, director of the internal combustion engine pressure sensor China Automobile Engineering Society, said that with the need for energy-saving emission reduction and intelligent development, the automotive industry is destined to undergo disruptive changes. Lightweight and modularization are the future trends of the automotive industry. Advanced lightweight materials such as aluminum, composite materials, and carbon fiber materials will be widely used in the automotive industry. "Before 2050, electric drives still cannot fully replace the internal combustion engine drive. During this period, pumps and oil pumps will also face the challenges of lightweight and modular development." Fu Yuwu said.
Fu Yuwu believes that how to meet the safety collision standards, with the engine company to design a smaller, lighter, cheaper products, but also pumps, oil pump companies face the problem.
However, the improvement of the quality of the internal combustion engine is not only a technical problem, but also a process problem and a quality problem. This also requires the continuous improvement of the quality of internal combustion engine related parts and components.
Xing Min, Secretary General of the Internal Combustion Engine Branch of the China Association of Automobile Manufacturers, said that although there are few problems with the processing technology of internal combustion engines, after some products are designed at home, they cannot be put into production due to backward production processes. Even if it can be put into small batch production, the problem of product consistency becomes apparent. Enterprise product design, processing, equipment procurement, on-line monitoring and so on, the enterprise product quality is faced with a series of problems.
â– To increase efficiency must be combined with automated production efficiency and efficiency, which is the only way for the healthy development of the company, and the efficiency of automated production is the only way.
Dong Mingzhu, chairman of Zhuhai Gree Electric Co., Ltd., mentioned in an interview that companies will lose 30,000 people within three years. "Manual performance is too low!" At the meeting, Sun Yaozhong, general manager of Henan Xixia Auto Pump Co., Ltd. (hereinafter referred to as "West Pump") laments.
Sun Yaozhong introduced that the pressure on labor costs is getting bigger and bigger for every company. This is a problem that every company can't escape. "If you don't increase wages, companies will not be able to retain talent. Labor costs are getting higher and higher, and they are also detrimental to the long-term development of the company. Automation is an inevitable choice for the development of enterprises," said Sun Yaozhong.
Sun Yaozhong was prompted to have this idea, in addition to the business itself is facing the recruitment pressure there are two external factors. It is reported that a Turkish pump manufacturer not only supplies West Pump, but also pumps to seize the market. The company has a high degree of automation. A person in a large room can fully operate. This makes him feel deeply. After visiting the fully automated shock absorber equipment line acquired by Italian companies in the Jingchuan shock absorber plant, he was more determined to take the automation route. To this end, Xipu shares have been tendered and a fully automated production line will be built.
â– Low-cost war is not a good business At present, the main engine plant is reducing prices year by year, labor costs and raw material costs are rising, and industry competition is fiercer. How to maintain healthy development in the fierce competition and to better compete with multinational companies on the same stage is still the focus of the company.
Pay in the military believe, auto parts enterprises are to become bigger and stronger, enterprises should be prepared to co-development, including collaborative research and innovation, and universities, research institutions to develop new products; the same time, government and industry bodies to play innovation Leading role. “Enterprises should develop in groups and formulate healthy industry rules and regulations, and they can't just fight bloody price wars.†Sun Yaozhong said, “In India, Turkey and other countries, the labor cost is low, and the prices of pumps and oil pump products are slightly lower than those in China. Nowadays, they are also entering the domestic market. With low-price competition and no good companies, everyone will have no money to earn. "Because of low-price competition, the price of Chinese water pump exports to the German aftermarket has continued to decline in previous years. In recent years, it has not been able to increase.
In fact, industry self-regulation involves the protection of intellectual property rights. Some companies put on other manufacturers' trademarks to sell their products, so that other companies no longer dare to invest in scientific research funds for research and development. Sun Yaozhong, for example, had previously had a very small problem in the single-cylinder machine that affected the safety performance of the product. However, due to the consideration of intellectual property rights, no one has been willing to come forward to solve it. Only by urging the industry to respect intellectual property rights can the intellectual property rights be protected effectively and create a better R&D environment for enterprises.
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:
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.
Tungsten carbide roller material design
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.
Tungsten carbide roller category
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 roller production process control
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.
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