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44902ofryvrvl
Mar 29, 2022
In General Discussions
In this article we analyze the factors that affect machining productivity according to the problems encountered in actual factory production. The most important factors are: The quality of the product design. The method of forming the blank. The machining technology used. The method and level of production management in machine and tool shops. So the way to improve machining productivity should start from the following areas. Process measures to improve machining productivity Reduce work hours for a part First, you need to shorten the basic time. In mass, or large-scale production, the basic time represents a large proportion of the unit of time, productivity can be improved by shortening the basic time. The main ways to shorten the basic time are as follows: Increasing the cutting amount, increasing the cutting speed and the feed rate can shorten the basic time, which is an effective method of improving productivity widely used in machining. However, the increase in the amount of cut is limited by the durability of the tool and the power of the machine tool and the rigidity of the process system. With the advent of new materials for machine tools, cutting speed has been rapidly improved. At present, the cutting speed when using cemented carbide turning tools can reach 200 m / min, and the cutting speed with ceramic cutting tools can reach 500 m / min. In recent years, the cutting speed of polycrystalline cubic boron nitride and polycrystalline synthetic diamond burs for cutting ordinary steel reached 900m / min. In terms of grinding, the trend in recent years has been high speed grinding and hard grinding. Simultaneous cutting with multiple blades. Multi-part machining This method improves productivity by reducing lead-in, cutting, or basic tool time, thus shortening the basic time for each part. There are three ways to process multiple parts: multi-part sequential machining, multi-part parallel machining, and multi-part parallel sequential machining. Reduce the machining margin. Advanced processes such as precision casting, die casting, precision forging, etc. are used. Second, shorten the auxiliary time. The auxiliary time also represents a large proportion of the time of a single piece, especially after greatly increasing the amount of cut, the basic time is significantly reduced and the auxiliary time is a larger proportion. At this time, taking steps to reduce auxiliary time becomes an important direction to improve productivity. There are two different ways to shorten the auxiliary time. One is to mechanize and automate the auxiliary action, so that the auxiliary time is directly reduced; the other is to make the auxiliary time coincide with the basic time and indirectly shorten the auxiliary time. Directly reduces auxiliary time. The workpiece is clamped by a special device and there is no need to align the workpiece during clamping, which can shorten the loading and unloading time of the workpiece. When mass production is carried out in large quantities, high-efficiency lathe clamping chucks are widely used to shorten the loading and unloading time of workpieces. In the small batch production of a single piece, due to the limitation of the manufacturing cost of the special accessory, to shorten the loading and unloading time of the workpiece, a combination accessory and an adjustable accessory can be used. In addition, to reduce the auxiliary time of stop measurement during processing, an active detection device or digital display device can be used for real-time measurement during the machining process, and thus reduce the required measurement time. in the process. The active sensing device measures the actual size of the machined surface during machining and automatically adjusts and manages the machine according to the measurement results, such as automatic grinding measuring devices. The digital display device can continuously and accurately display the amount of movement or angular displacement of the machine tool during the machining process or the adjustment process of the machine tool, greatly saving the auxiliary time of the stop measurement.
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