HBIS Successfully Rolled Out a 100-meter High-speed Rail

On May 15th, at the large steel rolling plant of HBIS, a 100-meter-long rail like a fiery red "giant dragon" was smoothly off the assembly line. Gan Wei, director of HBIS's large-scale rolling mill, said that this is a 350 km / h 100-meter high-speed rail tailored for the national railway project Lunan High Speed ​​Rail. The first batch of more than 4,000 tons has been shipped. They will ensure that the total contract orders The supply of 22,000 tons was completed on schedule.

350 km / h high-speed orbit is currently the world's highest-speed high-speed orbit, which in a certain sense represents "world speed".

High-speed heavy rail production has strong continuity, complex smelting process, and difficult rolling. It belongs to the "high, precise, sharp, special" steel grade, which represents the manufacturing level of iron and steel enterprises and is an important material for high-speed rail construction. The heavy rail products previously supplied by Hegang Handan Steel are mainly used for 160km / h and 250km / h speed grade railway construction.

The high-speed heavy rail at the speed of 350 km / h is extremely challenging for quality requirements and production difficulty. After receiving the batch of orders, Hegang Handan Iron and Steel Co., Ltd. overcame various difficulties, specially formulated R & D trial production, production organization, process control and product shipment and other plans, and organized technical personnel to carry out special research. According to the requirements of high dimensional accuracy, high flatness, and high surface quality rolling, special measures were formulated to improve and improve the rail rolling temperature control, guide and guard assembly adjustment, and straightening process parameter optimization to ensure the quality of the final product. qualified. After the product is off-line, all performance indexes of the rail fully meet the requirements of relevant standards. "In the first four months of this year, the production and sales of heavy rail increased by 43.1% year-on-year." Li Junzheng, deputy director of Hegang Handan Steel Heavy Rail R & D Center, said that from trial production to mastering more than 70 core technologies, he obtained more than 40 patented technologies. The quality of Handan Steel's rail products has been improved step by step. Last year, the products were heavily used by the 12 main railway lines of 8 railway bureaus such as Shanghai and Xi'an and the subways of 9 cities such as Chengdu, Taiyuan and Qingdao. Infrastructure construction.

The difficulties of CNC production and processing of stainless steel plates are: the adhesion and fusion of stainless steel plates are very strong, and the cutting is very easy to adhere to the side edges of the turning tool, which makes the drilling standard worse. The cutter teeth are easy to chip and damage.

CNC production and processing of stainless steel plates. In addition to end mills and some end mills, tungsten steel can be used as the raw material for the side edges of turning tools. All other turning tools are made of front steel. The actual effect, the durability of the tool can be improved 1 to 2 times than W18Cr4V. Carbide grades suitable for making stainless steel turning tools are YG8, YW2, 813, 798, YS2T, YS30, YS25, etc.
When CNC manufactures and processes stainless steel plates, the drilling edge is not only sharp but also able to bear impact, and the chip flute is larger. Large spiral angle turning tools (cylindrical turning tools, end mills) can be selected. The spiral angle b is increased from 20 ° to 45 ° (gn = 5 °). The durability of the tool can be increased by about 2 times. During the work of the knife, the rake angle g0e is increased from 11 ° to about 27 °, and the CNC production and processing are cheerful. However, the b value is not suitable for any larger value. It is very appropriate for the end mill to use b≤35 ° to prevent the side edge from being weakened.


The wave-shaped end mill is used to produce and process stainless steel pipes or thick-walled parts. The drilling is cheerful, the vibration is small, the cutting is easy to break, and the steel parts are not deformed. The use of tungsten steel end mills for high speed CNC production and processing, and indexable end mills for CNC production and processing of stainless steel plates can achieve excellent practical results.