Abstract
In machining operation, the cutting parameters greatly influences on the spindle vibration of a CNC wood milling machine. The paper presents the effect of the cutting parameters such as feed rate, cutting speed, and cutting depth on the vibration amplitude of the spindle when machined on CNC milling machine using Box-Hunter method of experimentation. The lowest natural frequency of this machine is 250 Hz. Experimental results have established a second-order regression equation that demonstrates the effect of three parameters such as feed rate, cutting speed, and cutting depth on the vibration amplitude of the spindle. From that base, determine the most reasonable cutting parameters when machining on CNC wood milling machines so that the spindle vibration amplitudes is minimal. In addition, The comparison results show that the spindle head vibration amplitude of the machine using the bolt joint is larger than the spindle head vibration amplitude of the machine using the weld joint.
Highlights
The base and other major components of a machine tool have been made of gray or nodular cast iron, which has the advantages of low cost and good damping, but the disadvantage of heavy weightIn modern machine design, lightweight structures are desirable because of ease of transportation, higher natural frequencies, and lower inertial forces of moving members
The comparison results of spindle vibration amplitude for two different machine structure types are the structures using the welded joint and the bolt joint.The results show that the spindle head vibration amplitude of the machine using the bolt joint is larger than the spindle head vibration amplitude of the machine using the weld joint
The paper presents the effect of the cutting parameters such as feed rate, cutting speed, and cutting depth on the vibration amplitude of the spindle when machined on CNC milling machine by experimental design method (DOE)
Summary
The base and other major components of a machine tool have been made of gray or nodular cast iron, which has the advantages of low cost and good damping, but the disadvantage of heavy weightIn modern machine design, lightweight structures are desirable because of ease of transportation, higher natural frequencies, and lower inertial forces of moving members. The base and other major components of a machine tool have been made of gray or nodular cast iron, which has the advantages of low cost and good damping, but the disadvantage of heavy weight. Lightweight designs are a basic goal in machine tool design and require fabrication processes such as mechanical fastening (bolts and nuts) of individual components and welding. Bolted and welded machine tool structures consists of pre-cut stock materials such as plates, tubes, channels, and angles which are joined together to form the structure in Fig.. Such stock items are available in a wide range of sizes and shapes and have some highly desirable mechanical properties such as formability, machinability and weldability. Despite the shortcomings listed above, designing and building a machine as a welded structure has the big advantage of a much lighter design with a substantially shorter lead time compared to a cast design
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