Nozzle device of spiral core control flow beam for micro-abrasive air jet machining

Abstract

The invention discloses a nozzle device of a spiral core control flow beam for micro-abrasive air jet machining. The nozzle device comprises a nozzle body, a nozzle base, a nozzle, a spiral core, a spiral core base, a spiral core balance spring and a spiral micro-adjuster, wherein the nozzle is sleeved in the nozzle base; the nozzle base is arranged on the nozzle device body; the spiral core is connected with the spiral core base in the nozzle base; the spiral micro-adjuster is connected with the upper end of the nozzle device body through thread, and the lower end of the nozzle device body is connected with the upper end of the spiral core base; and the spiral core balance spring at the lower end of the spiral core base keeps the upper end of the spiral core acting on the spiral micro-adjuster all the time. Two compressed air input connectors are symmetrically arranged on the nozzle device body and connected with two air input passages. Gyroscopic motion effect is produced by two-phase flow air mixed with micro-fine abrasive and the abrasive through the position adjustment of the spiral core and the effect of the spiral groove of the spiral core, so that the external diffusion tread of the flow beam is limited to ensure uniform distribution of jet velocity in the flow beam, contribute to uniform removal of the grinded material of the part and improve the quality of the micro-abrasive jet machining.

Description

technical field [0001] The invention relates to the technical field of micro-abrasive jet machining (MJAM), in particular to a nozzle device for micro-abrasive air-jet machining with a helical core to control flow. Background technique [0002] In the field of micro-abrasive jet processing technology, the gas medium is mixed with fine abrasives such as alumina, silicon carbide, boron carbide, cerium oxide and iron oxide to form a two-phase fluid. Among the injection equipment, the nozzle device is one of the key technologies. When the two-phase fluid pressurized to 0.1-0.8MPa is sprayed from the nozzle to the surface of the workpiece, the shape of the stream, including the degree of divergence, velocity distribution and pressure distribution, will directly affect the material removal efficiency, spraying accuracy and surface integrity, etc. Generally, in order to ensure the shape accuracy of the surface of the sprayed part, it is hoped that the injected stream can be gathe...

AI Technical Summary

Problems solved by technology

When using straight-hole nozzles and tapered-hole nozzles, when the two-phase flow gas exits, the internal energy of the gas molecules is released, causing the stream to diverge; Venturi nozzles and Rafal nozzles are nozzles with gradually expanding outlets, which make full use of The principle of the transfer of energy to kinetic energy in the two-phase flow gas can obtain supersonic jet velocity, but the principle of obtaining supersonic velocity is to make the flow velocity diverge outward, which makes the uniformity of velocity distribution inside the flow stream worse.

TU Delft University in the Netherlands proposed a square nozzle with adjustable flow channel based on the Rafal principle. The uniformity of the internal velocity distribution of the flow stream can be improved through proper adjustment of the flow channel, but it cannot solve the flow control problem of the round hole nozzle. , therefore, it is of great practical significance to invent a new device for controlling the stream

Images