Water jet mixing tubes used in water jet cutting devices and method of preparation thereof

摘要

A method for preparing an improved two membered substantially crack-free water jet mixing tube (5) of an abrasive water jet cutting device comprises chemically vapor depositing diamond layer (502) on a funnel shaped support member to form an inner member of the mixing tube, separating the inner member from the support member, depositing and then cooling an outer member (504) on the outer side of the inner member (502) to produce a compressive stress on the inner member that substantially prevents formation cracks on the inner member. The inner side of the inner member (502) has a smooth bore having a microcrystalline structure and the outer member (504) has a higher coefficient of thermal expansion than diamond. The invention is also directed to a water jet cutting device that incorporates the aforementioned improved substantially crack-free water jet mixing tube. IMAGE