RU2463136C2 - Ultrasound hydrocutter - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in metal cutting with the help of water jet. Proposed device comprises guide head with channel to feed water to machined blank provided with two electrodes connected in electric resonance circuit driven by inverter.

EFFECT: possibility to machine various materials.

1 dwg

Description

The invention relates to the field of material processing, and in particular to a device for processing materials by cutting with a jet of water.

The technical result achieved by the device is to provide a localized pulsed exposure to high pressure, repeated at least with an ultrasonic frequency, on the material of the workpiece.

The achievement of the technical result is ensured by connecting a portion of the water flow supplied to the billet in the circuit of the electric resonance circuit. The alternating electric current of the resonance circuit, according to the lynch effect, causes periodically repeated pressure on the axis of the water flow, the further propagation of which along the axis of the flow provides a periodic impact on the workpiece.

The device contains a guiding head 1, supplying a stream of water 2 to the workpiece 3 through the water supply channel 4, equipped with two electrodes 5 connected to the circuit of the electric resonant circuit 6, operating from the inverter 7. Also, the device can be equipped with a sump 8, designed to absorb the return pressure waves.

Figure 1 presents a diagram of a device.

During operation, the water flow passing through the guide head closes the resonant circuit circuit, the amplitude value of the current of which reaches a large value, of the order of several hundred amperes, which ensures a high value of repeated pressure on the axis of the flow. The maximum pressure on the axis of the flow can be calculated as the pressure on the axis of the channel of the electric current with the lynch effect:

where W is the value of the maximum pressure of the lynch effect;

µ is the magnetic permeability of water ≈1;

I is the amplitude value of the current strength;

π ≈ 3.141592;

r is the radius of the channel between the electrodes of the guide head.

With an amplitude value of the current in the resonant circuit of 400 A and a channel radius of 10 mm, the maximum value of the pressure on the channel axis will be 40.5 MPa. Pressure on the axis of the water channel extends along the axis of the stream and acts through the cutting part of the jet on the workpiece to be processed, which ensures the destruction of the workpiece material at the point of contact with the water stream.

In addition, a cyclic change in pressure in the axis region of the flow section connected to the resonant circuit allows the use of substances and compounds having variable solubility in water and decreasing with increasing pressure, in order to form abrasive particles of nanodispersed size directly in the water channel, which will increase cutting efficiency . Providing sufficiently high values of current strength, and, accordingly, pressure on the flow axis, ice particles released from the liquid phase can act as abrasive particles.

Thus, the described device provides a localized effect of repeated high-pressure ultrasonic frequency on the workpiece material, which allows it to be used for processing materials by cutting with a jet of water.

Claims (1)

A device for processing materials by cutting with a jet of water, containing a guide head having a channel for supplying water to the workpiece, characterized in that the channel for supplying water is equipped with two electrodes connected to an electric resonant circuit operating from an inverter.