Abrasive water jet nozzle and abrasive water jet machine

Abstract

Provided is an abrasive water jet nozzle comprising a mixing chamber for absorbing the abrasives with air through a supply port; a water nozzle; a mixing nozzle disposed on the downstream side against the water nozzle, to mix the abrasives in a water jet jetted out of the water nozzle, and to jet the water jet into the mixing chamber out of a through hole of the mixing nozzle; and an abrasive nozzle disposed on the downstream side against the mixing nozzle, to introduce the water jet thereinto to jet an abrasive water jet. A diameter of the through hole is larger than that of the water nozzle so that the abrasives in the mixing chamber are absorbed with air in a clearance between the through hole and the water jet passing through the through hole to mix the abrasives in the water jet.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the foreign priority benefit under Title 35, United States Code, 119 (a)-(d) of Japanese Patent Application No. 2012-089748, filed on Apr. 10, 2012 in the Japan Patent Office, the disclosure of which is herein incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present invention relates to an abrasive water jet nozzle comprising a mixing nozzle to absorb abrasives in a through hole thereof to mix the abrasives in a water jet, and an abrasive water jet machine including the abrasive water jet nozzle.[0004]2. Description of Background Art[0005]An abrasive water jet machine is known as a machine to cut a workpiece having a thickness to some extent or made of hard material. In general, like glass, a stone, a synthetic resin, and a composite material like a carbon fiber reinforced plastic (CFRP) are included in the hard material. The abrasive water jet machine improves ...

AI Technical Summary

Benefits of technology

[0011]However, in the prior abrasive nozzle, the abrasives supplied to a mixing chamber are directly involved and absorbed in the water jet by jetting the water jet into the mixing chamber. Hence, there are problems to cause the abrasive nozzle to be filled with and / or to be worn by the abrasives because the abrasives are concentrated at an inlet port of the abrasive nozzle. Especially, when an inner diameter of the abrasive nozzle is made small in order to improve the precision of the cutting process, the quantity of abrasives is saturated in the abrasive nozzle so that the abrasive nozzle tends to be further filled with the abrasives.

Problems solved by technology

However, in the prior abrasive nozzle, the abrasives supplied to a mixing chamber are directly involved and absorbed in the water jet by jetting the water jet into the mixing chamber.

Hence, there are problems to cause the abrasive nozzle to be filled with and / or to be worn by the abrasives because the abrasives are concentrated at an inlet port of the abrasive nozzle.

On the other hand, there is another problem to cause the precision or the quality of the cutting process to be uneven in a case that the cutting process is done by using the abrasive water jet containing an inadequate quantity of abrasives.

Furthermore, the abrasive nozzle may be worn further when the abrasives unevenly enter and are mixed in the abrasive nozzle.

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