SU405118A1 - DEVICE FOR MODELING THE CUTTING PROCESS - Google Patents

Description

one

The invention relates to the field of electrical modeling.

Lime device for diaamic testing of stakes without cutting using vibrators. Such devices include a vibration exciter — a vibrator placed on a flock. The vibrator is powered by a power amplifier, the oscillation frequency being set by a sound generator. Tests are conducted over the entire frequency range, and the obtained characteristic of the elastic system of the bead by additional processing with the cutting characteristic makes it possible to obtain the magnitude of the chip limit.

However, the known devices have large dimensions, especially they are large in the power amplifier. In addition, such devices require additional processing of test results.

Along with this, it is possible to test a system at only a few frequencies. For mechanical systems, such frequencies are resonant. In this case, as it is known, low power is required to excite the system, therefore, the dimensions of the amplifier and the rest become small.

The purpose of the invention is to create a small-sized device for modeling the cutting process, while modeling

it is combined with the machine and works in natural time scale.

This is achieved by the fact that when the mechanical and electronic parts of the device are closed, a feedback circuit is organized, and the delagg phase shifter is positive.

The drawing shows a block diagram of the device.

It contains the system under study 1, sensor 2 displacement, phase shifter 3, power amplifier 4, electromagnetic vibrator 5 with alternating and direct current coils, source 6 of constant current.

The core of the vibrator is exchanged, on the table or the sunnort of the machine, the mandrel serves as the anchor of the vibrator, closed in the middle of it.

The displacement transducer is fixed in the vibrator case and measures the relative displacements of the core and core. The output transducer imbalance, which is proportional to the movement of the sensor, is fed through the phase shifter to the power amplifier. The output of the power amplifier is connected to the AC coil of the vibrator. The coil of direct current of the node is connected to a source of constant current, which carries out the charging of the vibrator.

It is known that

cutting force is described by the equation

k-b

R

Yes,

+ P-Tf

where k is the specific cutting force; b is the width of the layer to be cut; Yes - the change in the thickness of the cut Tu - constant cutting time.

The gain of the system models the specific cutting force k. A constant current creates a force proportional to the cutting force with a width b and thickness, different from the layer being cut. The magnitude of the phase shift introduced by the time constant Gr is modeled by the phase shifter. The change in the thickness of the layer being cut, Yes, measures and inserts a displacement sensor into the model.

Thus, the force developed by the vibrator simulates two component cutting forces: a constant, due to the width b and the thickness a of the layer to be cut; variable due to the width b and the change in the thickness of the cut layer Yes.

When testing machines, changing the gain, magnetisation and phase shift in a closed system allows us to simulate the cutting process. A non-cutting chip width is determined, at which stable machine operation is observed, i. C. no vibrations.

Subject invention

A device for modeling the cutting process, containing the system under study, a power amplifier and a vibrator, to the first input

which DC source is connected, characterized in that, in order to reinforce the device, it contains a displacement sensor5, the input of which is connected to the output of the system under study, and a phase shifter, the input of which is connected to the output of the displacement sensor, and the output through an amplifier the second input of the vibrator, and the output of the vibrator is connected to the input of the system under study.