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Experimental Study on Machining Ultra-High Strength Steel 30Cr3SiNiMoVA by Milling Instead of Grinding

Author: WangXiang
Tutor: ChenMing
School: Shanghai Jiaotong University
Course: Aviation Aerospace Manufacturing Engineering
Keywords: ultra-high strength steel high speed milling parameter optimizing tool wear milling instead of grinding
CLC: TG54
Type: Master's thesis
Year: 2012
Downloads: 65
Quote: 0
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Abstract


Ultra-high strength steel not only has high strength and hardness, but also has certain plasticity and toughness, and has been widely used in aerospace industry, etc. However, its characteristics of high strength and high hardness and low thermal conductivity make it be a difficult machining material. Traditional processing of ultra-high strength steel generally adopted the combination of rough cutting and finishing grinding, so that the entire process has too many process steps, and is also time-consuming and inefficiency. Moreover, grinding force is large, and grinding temperature is high, which is disadvantageous for processing quality assurance. The low production efficiency and processing quality force people to adopt high-speed cutting technology instead of grinding to finishing ultra-high strength steel.With the development of high-speed machine tools and cutting tool technology, high-speed cutting technology has been applied in all fields, such as aerospace, mould manufacturing, automobile, and engineering machinery industry. High-speed cutting can not only greatly improve the processing efficiency, but also obtain considerable processing quality. Therefore, using high-speed cutting, especially high-speed milling, instead of the original grinding to achieve the finishing of ultra-high strength steel and other difficult machining materials has become a research hotspot in recent years. However, the high-speed machining mechanism is considered to be researched further. Meanwhile, the research concerning cutting ultra-high strength steel is little. Lack of reliable theory and practical guidance restricts the application of high-speed cutting to machining ultra-high strength steel.According to the state art of the machining process for ultra-high strength steel, this paper aims to evaluate the high-speed milling performance of 30Cr3SiNiMoVA, and look for the feasibililty concerning high-speed milling ultra-high strength steel instead of grinding by comparing the experimental results of two process methods. The main content of this paper is as follows:1.Experiments are done by Taguchi design. Cutting force, cutting vibration and surface roughness were researched to evaluate high-speed milling performance of the ultra-high strength steel. Mathematical model were developed to further analyze the effects of cutting parameters on the cutting force, cutting vibration and surface roughness.2.Based on the above mathematical model, the optimum cutting parameters is obtained by using multi-objective programming method. The predicted results were in agreement with the experiment, which provided theoretical foundation for problem solving in industrial production.3.Experiments of tool wear are done under the parameters selected from the optimizing results. According to the wear and failure forms of coating tool in high-speed milling of ultra-high strength steel, analyze its wear mechanism to provide guidance for tool selection in production line.4.Grinding experiments are done by single factor design. At the same time, compare the experiment results of two process methods, including surface roughness, residual stress, surface hardness and cutting force, and verify the feasibililty about high speed milling ultra-high strength steel instead of grinding.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Milling and milling machine
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