A magnetic field assisted micro-abrasive water jet machining method and its spraying device

Abstract

The invention discloses a magnetic field-assisted micro-abrasive water jet processing method and its spraying device. The processing method is that the water jet flows through a central pipeline through a high-pressure water nozzle to spray a high-pressure water jet, and the magnetic abrasive enters a mixing chamber through the abrasive inlet, and the water jet and Abrasives are mixed in the mixing chamber, and under the action of the magnetic field, a collimated high-speed abrasive water jet is formed, and finally sprayed out through the abrasive nozzle. The injection device involved includes a magnetic field generating device and a nozzle fixing device, the magnetic field generating device is installed on the nozzle, and the two are coaxial; the magnetic field generating device includes a metal ring, a solenoid, and a direct current power supply. The nozzle fixing device includes an L-shaped angle iron, a fixing frame and a hexagonal thin nut. In this device, the abrasive water jet adopts post-mixing type, and the abrasive adopts magnetic abrasive. When the abrasive and high-pressure water start to spray in, the magnetic field device starts to work to form a stable magnetic field, so that the jet beam can accurately and stably act on the surface of the workpiece. The invention solves the problems of non-uniform abrasive suction and divergent jet beams of the nozzle device by adding a magnetic field device to the abrasive nozzle.

Description

technical field [0001] The invention belongs to the technical field of special processing, and relates to a magnetic field-assisted micro-abrasive water-jet processing method and a spraying device thereof, in particular to a micro-abrasive water-jet processing method that can be widely used in cutting and polishing of metals, ceramics, composite materials, etc. and its nozzle device. Background technique [0002] With the development of production and the needs of scientific experiments, the demand for fine parts with high hardness, high brittleness and high melting point continues to grow. Many industrial sectors, especially the national defense industry, require cutting-edge scientific and technological products to develop in the direction of high precision, high temperature, and high pressure. The materials they use are becoming more and more difficult to process, and the requirements for machining accuracy and surface roughness are also getting higher and higher. , many...

AI Technical Summary

Problems solved by technology

Microabrasive water jet processing technology has unique advantages, but there are also many bottlenecks restricting its development:

At present, the abrasive supply methods of water jet processing devices at home and abroad, especially the fine abrasive water jet processing devices, generally have problems such as uneven abrasive supply and difficulty in accurately controlling the flow rate;

[0004] (2) The abrasive water jet injection device is easily blocked

Uneven abrasive flow is often the cause of clogging of fine abrasive systems

Due to the compressibility of the air, when the system pressure is reduced, a large amount of abrasive in the fine abrasive system will be ejected, which directly leads to a sharp increase in the abrasive content in the abrasive water jet, which is also very prone to blockage;

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