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Novel Method to Increase Nozzle Life And Reducing Nozzle Size On Water Jet Cutting Tool

IP.com Disclosure Number: IPCOM000101749D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Fredericks, EC: AUTHOR [+3]

Abstract

This article discloses a method to effectively extend the useful nozzle lifetime and to simultaneously reduce nozzle size. Typically, nozzle heads for water jet cutting tools are made from sapphire or carbide materials. A generic nozzle assembly is shown in Fig. 1. When using abrasive compounds, under a highly pressurized environment (25000 to 50000 psi), the average worst-case lifetime of nozzles constructed from such materials is 4 to 6 hours Also, the minimum nozzle size created by conventional machining techniques is about 0.02 inches in diameter. Fabricating a nozzle size smaller than 0.02 inches for fine-line cutting is extremely difficult.

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Novel Method to Increase Nozzle Life And Reducing Nozzle Size On Water Jet Cutting Tool

       This article discloses a method to effectively extend the
useful nozzle lifetime and to simultaneously reduce nozzle size.
Typically, nozzle heads for water jet cutting tools are made from
sapphire or carbide materials.  A generic nozzle assembly is shown in
Fig. 1.  When using abrasive compounds, under a highly pressurized
environment (25000 to 50000 psi), the average worst-case lifetime of
nozzles constructed from such materials is 4 to 6 hours   Also, the
minimum nozzle size created by conventional machining techniques is
about 0.02 inches in diameter.  Fabricating a nozzle size smaller
than 0.02 inches for fine-line cutting is extremely difficult.

      The proposed method comprises a CVD diamond deposition which
uniformly coats the inner walls of a nozzle head with a layer of
diamond protecting film (1).  This film has been found to have many
properties similar to those of pure diamond (2).  Therefore, it is
excellent for such a protective coating.  In Fig. 2, the dimensions
of the nozzle head before and after coating are illustrated.  With
current nozzle head design, there will be no problem of obtaining an
uniform coating through a diamond CVD process.  Furthermore, since
CVD deposition is a batch process, the coating process is very cost
effective.

      References
(1)  J. C. Angus, C. C. Hayman, "Low Pressure, metastable growth of
diamond and dia...