Study on CAM Technology of High Speed Machining
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According to requirements of NC programming of high speed machining,the proper strategies were selected based on the rough and finish machining of high speed machining by CAM software,which can satisfy process conditions of high speed machining and ensure the machining quality.Cite
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From different aspects such as efficiency,precision of machining,the superiority and feasibility of high-speed machining of thin-thickness boxed-shaped workpieces were analyzed.Aiming at the process features and technical requirements of machining,the measures were put forward to resolve the process problems of machining.The practices show that the application of high-speed machining technology in machining thin-thickness boxed-shaped workpieces can gain high efficiency and good surface quality.
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Abstract NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract High Performance Machining: A Practical Approach to High- Speed Machining Abstract High-speed machining (HSM) has become a popular topic in CNC machining methodology in recent years. Simply defined, high-speed machining is a methodology to improve machining throughput by using higher-than-normal spindle speeds coupled with extraordinarily high feed rates without compromising the quality of the finished part. However, in practice, HSM is not a straightforward methodology to implement. In addition to the higher spindle speeds, numerous other factors like feed, chip loading, width and depth of cut, cutter path, tooling, machine construction, CNC-machine controls and CAM software all impact the HSM process. Most conventional CNC machines are equipped with a spindle with lower rpm limits (under 12,000 rpm), so the term “high performance machining” is adopted (HPM). Applying HPM methodology requires the manufacturing engineer to possess in-depth knowledge of the limits of the CNC machine and how to work around them. An initial investment into discovering the limits of any CNC machine is critical to applying HSM techniques to non-specialized CNC machines to obtain high performance machining. This paper briefly addresses the basic concepts of HSM. Then a methodology taught at Arizona State University for systematically determining the high performance machining envelope for a CNC machine is described. A student- implemented case study of this methodology resulting in significant performance gains of machining an automotive part is presented. Introduction Current machining methodology is largely experience-based in that much of the knowledge has been handed-down from machinist to machinist via apprenticeships or on-the-job training. The traditional approach to machining often has problems solved by reducing the cutting speed and/or reducing the amount of material being cut1. This approach results in cutting parameters that are discovered through trial and error and are typically very conservative. Even when manufacturing education programs teach students to utilize references like Machinery’s Handbook3, machining parameters are somewhat conservative. Arizona State University manufacturing faculty believe it is important that manufacturing engineers interested in machining understand high performance machining, particularly as applied to conventional machine tools. Thus, their program teaches this content to interested seniors and graduate students. Such knowledge enables manufacturers to improve throughput and increase competitiveness without a significant investment in new machine tools. Typically, high-speed machining (HSM) is achieved by using small cut depths at very high spindle speeds (often over 20,000 RPM) and aggressive chip loads without a degragration of part accuracy or quality2. Maintaining a light cut depth allows for high feedrates while avoiding damage to the workpiece, spindle and cutter. A common pitfall common to first-time adopters of
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Based on the analysis of different 5-axis NC machine tool,some points about their characteristics and applications are introduced.Then,Through analysed the relationship between 5-axis machining and high speed cutting,proposed the developing tendency of high speed machining.
Machine tool
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Speed Machining is a new way of cutting,In the paper,the mechanism,characteristic,development and application of high speed machining are particular introduced.
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The techniques requirements,the concept and set up of stock-remaining,the characteristic of high speed finish machining based on stock-remaining were investigated.The results show that the stock-remaining machining is an effective method of high speed machining,and is a certain developing trend to realize the high speed and intelligent machining.
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This article introduces the definition of high speed cutting and expounds the features of high speed machining .The range, precision, surface quality and efficiency of high speed machining are compared with those of conventional machining.The high speed machining technology is widely applied in spaceflight,aviation,automobile,die and mould,and machine tool. It is a high efficiency,high quality,high precision and low energy consumption important machining method.
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From the view of optimizing the technology process of high speed machining, the paper gives out the NC programming methods for high speed die mold machining in detail, including the basic principle and method for creating the high speed machining tool path, the cutting output selection for high speed machining, the key controlling techniques for high speed and high accuracy machining as well as the high speed machining methods for standard surfaces and difficult_machining surfaces. The points should be paid more attention while working out the high speed machining programming methods according to the practice machining process have been proposed.
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