Abstract:
A fluid spray device system (1) that maintains a resultant fluid discharge, or a material onto which the resultant fluid is discharged, within a predetermined range of a set-point temperature by regulating the flow rate of a throttling gas using a proportional valve (22). The resultant fluid has throttling gas and cryogenic fluid components. Both the throttling gas and cryogenic fluid are preferably supplied from a single tank (11) and the cryogenic fluid supply is pressure-regulated and includes a triaxial delivery hose (33) having a return line with a back-pressure regulator (54).
Abstract:
A method of quenching a material by injecting a cryogenic fluid into a cooling stream and simultaneously venting gas from the cooling stream, in order to maintain a desired target pressure in a chamber containing the material. In a examplary application of the method, the quenching is a step in the heat-treatment of a metal and the chamber is part of a vacuum furnace. Also disclosed is a method of supplying a cryogenic fluid to a process in which the amount of cryogenic fluid necessary to perform the process is transferred from a storage vessel to a supply vessel via a supply line, after which the supply line is closed. An elevated pressure is maintained by vaporization of a relatively small amount of the cryogenic fluid that is allowed to build in a pressure vessel that is in fluid communication with the supply vessel.
Abstract:
A cryogenic fluid jet is used in an apparatus and a method for remote cooling of a cutting tool engaged in machining a workpiece under high-energy conditions, such as high-speed machining, hard-turning, cutting of difficult to machine materials, and combinations thereof. The apparatus and method use a stabilized, free-expanding cryogenic fluid jet having a pulse cycle time less than or equal to about 10 seconds. The apparatus and method increase the cleanliness of machined parts and chips and machining productivity of hard but brittle tools, including but not limited to tools which should not be cooled with conventional cooling fluids.
Abstract:
A method and apparatus for improving the surface finish and/or surface integrity of a workpiece formed or shaped with a tool increase the surface hardness of the workpiece during forming or shaping of the workpiece. A method and apparatus for forming or shaping a workpiece also increase the surface hardness of the workpiece during forming or shaping of the workpiece with a tool, as do a method and apparatus for manufacturing a finished part or product from a workpiece. In some embodiments, an expanding jet of cryogen may be jetted to a surface of a workpiece and a tool from a nozzle, wherein the cryogen is at least partially separated into a condensed phase portion and a vapor portion within a downstream portion of the nozzle.
Abstract:
Method of processing a workpiece comprising (a) providing a tool and a workpiece, wherein the workpiece has an initial shape; (b) placing the workpiece and the tool in contact to form an interface, applying force to the tool and/or the workpiece, and moving the tool and/or the workpiece to effect a change in the initial shape of the workpiece; (c) applying a lubricant to any area on a surface of the tool and/or to any area on a surface of the workpiece while the workpiece and the tool are in contact; and (d) applying a cryogenic fluid to any area on the surface of the tool and/or to any area on the surface of the workpiece while the workpiece and the tool are in contact.
Abstract:
A cryogenic fluid distributor for turret machine tools (e.g., lathes) directs a stream of cryogenic fluid from an external, pressurized cryogen source to a working position of a machine tool to prevent overheating of the tool. Designed for easy retrofitting and synchronizing with multi-tool turret machines, the distributor allows for a “dual-fluid” machining capability combining a cryogenic fluid and a conventional cutting fluid (flowing via a conventional coolant system built into a given machine tool). Made of low thermal-mass, insulating polymer and metallic parts, the distributor utilizes the different thermal contraction coefficients of the parts to establish cryogenic sealing connections, which eliminates undesired turret plate cooling and assures rapid cryogen flow start-up.
Abstract:
Graphite carbon surfaces are protected from elevated temperature oxidation and mechanical wear by electric arc thermal spray coating exposed surfaces with a titanium nitride or multi-element (e.g., aluminum-silicon-titanium) coating.
Abstract:
An improved electric arc spray process for the deposition of reactive metals is disclosed which utilizes compressed inert gases for atomization. The improved process utilizes argon, nitrogen, carbon dioxide, sulfur hexafluoride, or mixtures thereof supplied to the arc spray gun such that the mass ratio of the wire feed rate to the gas feed rate is greater than 0.10. The process can be used to coat various substrates with metals or alloys comprising magnesium, zinc, lithium, and other reactive metals. The process is useful for the application of cathodic corrosion protective coatings on various substrates.
Abstract:
A method and apparatus for galvanizing an elongated object, such as, but not limited to, a metal strip, wire, or rod, using gaseous nitrogen, a mixture of gaseous and liquid nitrogen, and combinations thereof is described herein.
Abstract:
An automatically actuated line connection and delivery system is disclosed for the delivery of a cryogenic fluid coolant to tools mounted on manufacturing machines such as vertical and horizontal machining centers, punching presses, thermal spray systems, welding systems, laser cutters, etc. The system includes a linearly-actuated, cryogenic fluid socket/plunger connection “(20)” with a differential, thermal contraction-controlled sealing mechanism, “(22,24)” as well as provisions for installing this connection on automated manufacturing machines “(60,84)” and integrating operation of the connection “(20)” with the manufacturing cycle controlled from a remote control panel “(70)”.