Introduction: Metal processing online reporters attended the annual meeting of China's steam turbine industry for two consecutive years in 2011 and 2012. Now, we are summarizing the key issues raised by various experts during those meetings. Some of these problems were specific to certain enterprises, and after discussions, some have already been resolved. Others represent common challenges within the industry, which we hope will draw the attention of tool experts and lead to further improvements.
Zhao Jianyong, Deputy Chief Engineer of Hangzhou Steam Turbine Co., Ltd.
Zhao Jianyong, Deputy Chief Engineer at Hangzhou Steam Turbine Co., Ltd. (referred to as Hangzhou Auto), shared insights on their machining practices. The company uses step drills and indexable tools for hole machining, but composite drills are not commonly used. Due to the large number of older machines, they often employ Sandvik Coromant’s 880 ladder drill with a stepping process. When high-speed cutting stops, retracting slightly helps achieve better chip breaking and cooling effects. In terms of boring operations, Iscar’s sickle-shaped tools are frequently used. However, when machining castings, if the size is too large, the cutting process can be interrupted, reducing efficiency. To address this, they now use milling methods instead. The small main cutting edge angle of the milling tool directs the cutting force axially, leading to a more stable cut and higher efficiency. Regarding high-speed steel tools, most are domestically produced, such as reamers used for blade root pin holes. In recent years, through collaboration with Hengfeng Tools Co., Ltd., they successfully developed a conical reamer that replaced imported versions. Previously, imported taps were widely used, but now, after working with Sichuan Tianhu Tools Co., Ltd., domestic taps account for over 60% of usage. Additionally, they have found that drilling spiral grooves on worn reamers can achieve results comparable to new ones, ensuring high precision and cost-effectiveness.
Laminated Glass,Laminated Glass Window,Pvb Laminated Glass,Tempered Glass Windows
Huaian Hongrui Glass Co.,Ltd , https://www.hongruiglass.com