Changshu Hongqiao Cast Steel Co., Ltd.: V-method casting is the abbreviation for vacuum sealed or negative pressure casting technology, which uses plastic film to cover the mold and seal the sand box. By relying on a vacuum pump to extract air from inside the mold, a pressure difference is created between the inside and outside of the mold box, causing the dry sand to compact and form the required mold cavity. Its biggest advantage is that the molding sand does not use binders, and the dry sand reuse rate is over 95%. It is not only energy-saving and environmentally friendly, easy to remove sand, and improves working conditions, but also greatly improves the surface quality and dimensional accuracy of castings.
Compared with wet casting, V-casting has higher surface hardness, longer dry sand insulation time, and smaller casting shrinkage. Therefore, V-casting has more obvious production advantages on steel castings, but it is also prone to defects such as carbonization and subcutaneous porosity. ABS Marine Engineering Services
In 1983, China Railway Shanqiao Group Co., Ltd. introduced a complete V-method production line from Japan's New East Company to produce high manganese steel switches, and successfully produced them. It is one of the earliest manufacturers in China to use V-method casting to produce high manganese steel castings. Nowadays, the products have been widely used in various infrastructure projects such as railways and bridges, making great contributions to the development of the national economy. Customized steel castings
It is generally believed that V-casting is not suitable for making small and medium-sized castings, and is only suitable for large and simple cast iron parts, such as counterweights and bathtubs. HWS Company has designed a V-method circular automated production line suitable for small and medium-sized cast iron parts, effectively improving the production efficiency of small and medium-sized parts.
A company in Zhuzhou uses the V-method casting process to produce small and medium-sized cast steel parts, including lower core discs, load-bearing saddles, and other castings. The mass of each individual casting is below 50kg, while small parts are only within 10kg.
In actual production, defects such as surface carbonization and subcutaneous pores have occurred, as well as difficulties in machining and cleaning during post-processing. Customized cast steel parts for ships
To address subcutaneous stomatal defects, it is necessary to increase the number of air outlets and extraction volume to enable the rapid discharge of gas from the cavity; For the problem of riser cutting, easy to cut spacers can be used to effectively reduce the problem of riser cutting, but the use of easy to cut spacers may result in other defects such as small riser inlet.
The V-method casting is more suitable for large and uncomplicated castings with internal cavities due to its technological characteristics, and has been widely and successfully applied in rear axle housings, rocking pillows, and side frames. With incomplete understanding, currently there are more than 10 enterprises in China that use V-casting to produce cast steel rear axle shells. For example, Tianrui Group Casting Company uses V-casting to mass produce B-grade K2 cast steel rocking pillows/side frames; Several V-method casting enterprises in Longyan, Fujian have adopted V-method casting for engineering machinery cast steel rear axle shells, and many other enterprises have also tried to produce them. Production of steel castings for spray preventers
The V-method casting has developed rapidly in China, and in recent years it has shown a trend of rapid development. Due to its low cost, low emissions, and good production environment, it has been favored by many enterprises. Its application in steel castings is also becoming increasingly widespread, and the production process is becoming more mature. At present, the defects such as carbonization and subcutaneous porosity in the production of medium and low carbon steel are restricting the progress of V-cast steel production. It is believed that the revolution in raw material production will drive the progress of the entire V-cast casting industry, and the application of V-cast in steel castings will become increasingly widespread.
Changshu Hongqiao Cast Steel Co., Ltd. mainly produces various specifications of carbon steel, high, medium and low alloy steel, stainless steel, heat-resistant steel, high manganese steel, and high chromium cast iron. Provide high-quality cast steel parts for industries such as petroleum, chemical, metallurgical, mining machinery, coal mining machinery, wind power, nuclear power, and marine, and export them abroad.