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At present, the machine tool has been successfully verified by the actual production of the user's factory, and successfully solved the technical problem of the outer part of the turbocharger, the key part of the turbocharger. This machine tool can replace the imported processing equipment of the same kind. The outer circular surface of the impeller is ground, and its contour dimensional accuracy, surface roughness and processing efficiency can meet the current production needs of users, and play a greater role in production. .
It is understood that the machine manufacturer's customer company, a power plant in Shanghai, is a professional factory producing medium-speed diesel engines and exhaust turbochargers. The impeller is a key component in the turbocharger. Its high operating speed is more than 40,000 revolutions per minute. The quality of the impeller's outer circular profile directly affects the service life and reliability of the turbocharger. The traditional processing method of the outer surface of the impeller is mainly for turning. Since the impeller material is nickel-based or chromium-based high-temperature alloy steel, it is difficult to process, and the tool is intermittently contacted with the workpiece during machining, the tool loss is large, and the surface quality after processing. Poor, low profile accuracy, which affects the quality and service life of the supercharger.
At that time, the plant introduced a high-end turbocharger with patented technology from MANB&W, Germany, and it was urgent to improve the quality of the impeller to ensure the performance of the supercharger manufactured by the German technology. Therefore, it is particularly urgent to improve the processing of the outer surface of the impeller as soon as possible. Due to the special hardness of the impeller and the difficulty of machining, the only effective way is to achieve high outer contour profile accuracy only by grinding. In order to find a suitable grinding machine, the user has inquired and turned to the famous domestic professional grinding machine factory, but it has not been difficult due to the difficulty in developing the machine tool.
At that time, the domestic machine tools for the grinding of the outer surface of the impeller were still blank, and the price of importing a special grinding equipment was as high as about 10 million yuan. After thorough investigation and investigation, the plant decided to entrust Hangzhou Machine Tool Group Co., Ltd. to develop and develop the first impeller outer circular surface CNC forming grinding machine in China.
Indeed, the development and manufacture of this machine with a new layout and a new processing method is more technically difficult. Because the workpiece is usually shaped to move in a straight line, the workpiece is usually rotated by a cylindrical surface or a conical surface. The externally shaped surface grinding is performed by the workpiece, and the contour accuracy and shape accuracy of the profile are required. There is a high demand, so the difficulty of forming the outer surface of the impeller is quite large, and it is the first grinding method and equipment in China.
In order to solve this technical problem, Hangji boldly adopted a layout form of full-column movement that has only recently emerged in the world. This kind of layout has applied for invention patents from the National Patent Office. The “full-column full-moving grinder†layout is adopted, the working table of the machine tool is fixed, and the longitudinal and lateral movements are completed by the column. The grinding head also performs vertical movement on the column, that is, the X, Y and Z axis movements of the machine tool are all ground. The head is completed. This layout form leaves a large space inside the machine tool, which creates the necessary conditions for the rotary machining of the impeller.
The first domestic full-column mobile grinding machine was successfully delivered
Recently, Hangzhou Machine Tool Group Co., Ltd. successfully developed a MKH450/1 CNC full-column mobile powerful forming grinding machine for a power plant in Shanghai. This is the first impeller outer-circular surface CNC forming grinding machine in China.