Methods for post-mold processing a Venturi device for generating vacuum are disclosed that improve the evacuation time thereof. The methods include providing a molded Venturi device having a body defining a Venturi gap between an outlet end of a converging motive passageway and an inlet end of a diverging discharge passageway, where the outlet end defines a motive exit having flash extending radially inward and the inlet end defines a discharge inlet having flash extending radially inward. Then, the method includes positioning the molded Venturi device with an inlet end of the converging motive passageway facing a blasting nozzle or with an outlet end of a diverging discharge passageway facing a blasting nozzle, and propelling blasting media into the motive inlet or the discharge exit of the Venturi device to remove the flash in the motive exit and in the discharge inlet, or vice versa.

A system for internal air blasting of an enclosed space includes a ground vehicle, an arm supported by the ground vehicle, and a blasting nozzle provided at the end of the arm. The blasting nozzle being configured to direct blast media to a desired surface of the enclosed space to be treated by the arm. A method of internal air blasting an enclosed space is further disclosed.

A device, system, and method is disclosed for cleaning the interior of the tubes in air-cooled heat exchangers. The tubes are cleaned using dry finely divided abrasive entrained in high pressure air blasted through the tube to remove any accumulation in the tube or on the tube walls resulting in a bright metal condition suitable for inspection by the Internal Rotary Inspection System, or application of a corrosion-resistant coating, or a lesser level of cleanliness appropriate for return to service. The device is electromagnetically attached to the outside of a ferromagnetic tube header, or to a ferromagnetic plate secured to the outside of a non-ferromagnetic plug-type header or a plate-type header of any material, to temporarily secure a grit-resistant nozzle assembly and position the nozzle for proper application of the high pressure air and entrained abrasive to facilitate cleaning, avoid tube damage, and provide for operator safety. The disclosure still further relates to a system and a method, both employing the device, to clean the interior of the tubes with dry abrasive blasting using high pressure air, and at the other end of the tube, capturing the air, spent abrasive, and material removed from the tube, separating the spent abrasive and removed material from the waste air, filtering the waste air, and exhausting the now filtered air to the environment; all without fugitive emissions.

A method of prepping a cylindrical inner surface of a bore using a high-frequency forced pulsed waterjet apparatus entails generating a pressurized waterjet using a high-pressure water pump, generating a high-frequency signal using a high-frequency signal generator, applying the high-frequency signal to a transducer having a microtip to cause the microtip to vibrate to thereby generate the high-frequency forced pulsed waterjet, and rotating the rotatable ultrasonic nozzle inside the bore to prep the inner cylindrical surface of the bore using the high-frequency forced pulsed waterjets exiting from the angled exit orifices of the rotatable ultrasonic nozzle.

A method of treating a surface of a mold. A preliminary treatment of dry-ejecting an angular carbide powder against the surface of the mold so as to cause elemental carbon present within the carbide powder to be diffused into the surface of the mold. The carbide powder has particle diameters not larger than those of a 220 grit and the carbide powder being dry-ejected at an ejection pressure of 0.2 MPa or greater. An after-treatment of dry-ejecting a spherical powder against the surface of the mold to cause the spherical powder to impact the surface of the mold and form innumerable circular arc shaped fine depressions. The spherical powder has a hardness not less than the hardness of a base material of metal of the mold and particle diameters not larger than those of a 220 grit and dry-ejected at an ejection pressure of 0.2 MPa or greater.

A method includes spraying a coating on to an engine bore surface, honing the coated surface to create a honed surface region, and cleaning the honed surface region to remove material from the surface pores. The honed surface region includes a plurality of surface pores and upper, middle, and lower regions. Cleaning the honed surface region produces upper, middle, and lower region surface porosities, with the middle region porosity being greater than at least one of the upper and lower porosities.

A method includes spraying a coating on to an engine bore surface, honing the coated surface to create a honed surface region, and cleaning the honed surface region to remove material from the surface pores. The honed surface region includes a plurality of surface pores and upper, middle, and lower regions. Cleaning the honed surface region produces upper, middle, and lower region surface porosities, with the middle region porosity being greater than at least one of the upper and lower porosities.

Device, system and method for fabricating a stent, the device including a reservoir that provides a supply of particles; an appliance having a high pressure generator that generates a particle beam from the supply of particles; a transport conduit that transports the particle beam; and a nozzle connected to the transport conduit that jets the particle beam outward from the device, where the nozzle is configured for insertion into a stent.

This relates to a method for manufacturing a lens element including: a refraction area having first curvature; a plurality of optical elements located on at least part of the refraction area, wherein the method includes a step of using an abrasive-filled fluid jet to manufacture the lens element.

A method for manufacturing a component of an axial turbine engine includes the following steps: (a) providing or producing a component with a temporary surface; (b) placing the component in a chamber containing particles; and (c) vibratory peening of the temporary surface using the particles. The chamber includes an abrasive paste mixed with the particles so as to polish the surface of the component during the peening step (c). Thus, at the end of the peening step (c), the surface becomes a polished surface with a surface compression stress or prestress. The present application is notably applicable to a one-piece bladed drum of an aircraft turbojet engine low-pressure compressor.