Page 19 - Станочный парк английская версия

METALWORKING EQUIPMENT AND TOOLS

The physical process of manufacturing parts analyze the components of vibration and
on metal cutting machines is accompanied acoustic emission were carried out using
by acoustic emission with a wide range a STERN brand BD16AV drilling machine.
of vibrations of various nature. Vibration To measure the kinematic amplitude
and noise arising from the technological characteristics of the vibration, we used
process of machining parts together with an ATTACOM ATT-9002 authorized digital
the capture of transformable energy from portable vibrometer, and CENTER-322
attorned sound level meter with an A filter
manufactured by Center Technology Corp.
for acoustic emission.
Based on the measured values of
the amplitudes using the approximation
technology, the main tool for studying the
operation is obtained - a mathematical
model and its graphical display for a number
of competing functions of the transient
spindle acceleration process.
A graphical model of the function of
the rms value of the vibration velocity with
a dissipative absorption coefficient £ v =
0.0107 is shown in Figure 2.

Fig. 1. Design of a bench drill with installed probe and
ATT 9002 vibrometer..
adjacent objects affect the shaping process A graphical model of the function
and the quality of production [2]. of the rms vibration acceleration with a
The Department of Engineering dissipative absorption coefficient £ a =
Technology conducted tests of a bench- 0.0499 is shown in Figure 3.
drilling machine with the aim of introducing
changes in the design, in particular of an
electric motor that generates both vibration
and mechanical noise. The analytical value of the sound
The machine was tested at free pressure level according to the measured
running at a spindle speed of 720 min- amplitude of vibration acceleration in
1. In the study, probe 2 was mounted on accordance with GOST 24346-80 has the
the table of machine 1 on the plane of the form [4]
workpiece, the vibrometer 3 (for clarity) is
conventionally placed on the plate of the
machine. Moreover, the level of the position where a is the measured average value
of the table is selected from the condition of of vibration acceleration, in experiments
stability. a = 4.7 m / s2; a0 is the initial value of
For the quantitative description and vibration acceleration, a0 = 1 ∙ 10-5 m / s2,
qualitative assessment of vibration, the substituting the measured value of vibration
diagnostics of the operability of industrial acceleration in function 3 we get La = 67.25
equipment of the rotor class, its vibration dBA.
components, such as vibration displacement, A graphical model of the sound
vibration velocity and acceleration with pressure level function with a dissipative
independent modern initial values, are most absorption coefficient £ L = 0.0276 is shown
often used [3]. in Figure 4.
Experimental studies to determine and

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