The technological process and management requirements of large-scale mechanical processing, Nanjing Precision Engineering Co., ltd

by:NJPE     2020-02-16
In the process of large-scale mechanical processing, those processes directly related to the transformation of raw materials into products are called technological processes. It includes blank manufacturing, parts processing, heat treatment, quality inspection and machine assembly, etc. However, in order to ensure the normal operation of the technological process, the manufacturing of cutting tools and fixtures and the adjustment and maintenance of machine tools are auxiliary processes. In the technological process, the processing method of Dalian large-scale mechanical parts gradually changes the shape, size, relative position and performance of the blank in a certain order, the part of the process until it becomes a qualified part is called a machining process. To a certain extent, in order to facilitate the compilation and execution of process regulations and the management of production organization, large-scale mechanical processing needs to divide the process into units of different levels to a certain extent. They are processes, installations, stations, steps and passes. The process is the basic unit in the process. The machining process of parts consists of several processes. One process may include one or several installations, each installation may include one or several stations, and each station may include one or several steps, each step may include one or several passes. Forced vibration during large-scale machining 1. Forced vibration: vibration caused by the external periodic interference force of the process system. There is no difference between forced vibration in mechanical processing and forced vibration in general machinery. The frequency of forced vibration is the same as or multiple of interference force. 2. Causes of forced vibration: the vibration sources of forced vibration come from the internal vibration source of the machine tool and the external vibration source of the machine tool. There are many external vibration sources, but they are all transmitted to the machine tool through the foundation and can be isolated by adding a vibration isolation Foundation. The main source of the machine is :(1)Vibration of machine tool motor. (2)Vibration caused by imbalance of high-speed rotating parts of machine tools. (3) Vibration caused by defects of machine tool transmission mechanism, such as changes in gear backlash, belt tension, etc (4)Vibration caused by impact during cutting. (5)Vibration caused by inertial force of reciprocating parts
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