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PROF. B. Koti Veerachari

Rakesh Kumar

.pptx   MACHINE TOOL VIBRATION.pptx (Size: 1.49 MB / Downloads: 243)

List of contents
Types of vibration
Effects of vibration
Sources of vibration excitation
Vibration control in machine tool

Machining and measuring operations are invariably accompanied by vibration.
To achieve higher accuracy and productivity vibration in machine tool must be controlled.
For analysis of dynamic behavior of machine tool rigidity and stability are two important characteristics.

The major part of the damping results from the interaction of joined components at slides or bolted joints.
The interaction of the structure with the foundation or highly damped vibration isolators also may produce a noticeable damping.
structural damping is significantly higher for frame components made of polymer-concrete compositions or granite.
A significant damping increase can be achieved by filling internal cavities of the frame parts with a granular material.
For cast parts it can also be achieved by leaving cores in blind holes inside the casting.
Damping can be increased by the use of dampers and dynamic vibration absorbers.
Damping can be achieved by placing auxiliary longitudinal structural members inside longitudinal cavities within a frame part.
A variation of the Lanchester damper is frequently used in boring bars to good advantage.

In the machining operation, the quality of the surface finish is an important requirement for many turned parts. Therefore, the choice of optimized cutting parameters is very important to control the quality of the required surface. The objective of the present experimental study is to optimize the cutting parameters using two measures of performance, machine tool vibration and roughness of the work surface. The prediction and control of vibration between the tool and the workpiece is important as a guide for the user to select the cutting depth, cutting speed, tool feed speed to minimize vibration. In the machining operation there are different variables detrimental to the desired result. In this process the behavior of the machine tool, the life of the cutting tool and the vibration of the cutting tool are the complex phenomenon that influences the dimensional accuracy of the components to be machined, the vibrations of the cutting tool are influenced mainly by cutting parameters such as cutting speed, cutting depth and the feed speed of the tool. In this project work, the vibrations of CNC cutting tools are controlled, the tool holder is supported with and without cushioning pad. To increase the precision of the experiments, Taguchi L9 experimental design method has used in this experiment. The experimental result was validated with analysis of variance (ANOVA) and regression analysis to identify the influences of the different cutting parameters on the vibration of the cutting tool.

The machine tools of the previous classes have been manufactured for many years and are still being manufactured today. These types of machines typically include a structurally supported saddle carrying one or more translatable tool holders adapted to support a variety of milling cutters, drill bars, or other tools and accessories.

In the operation of such machines, the vibration and vibration of the tools have hitherto been a perennial problem, imposing an undue limitation on the speed of metal extraction of the machine and on the life of many of its parts. So far different approaches have been tried in an effort to solve this problem, all with varying degrees of success. For example, one approach has been to increase the rigidity of the machine by tightening things such as adjusting bearings, gibs and spindle bearings. Another approach has simply been to increase the rigidity of the fastening fastening. Attempts have also been made to address the problem by applying torsional vibration dampers to the spindle drive transmission. However, the most common way of dealing with the problem has been to operate the machine with a combination of power and speed at which vibration and vibration are kept within tolerable limits.
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