摘要:
A component (50) for a gas turbine engine (10) is described. The component (50) may comprise a body portion (52) formed from a metallic material. The component (50) may further comprise an abrasive surface (54) forming at least one surface of the body portion (52), and the abrasive surface (54) may be configured to abrade an abradable material (56). The abrasive surface (54) may be formed from electrical discharge machining of the metallic material.
摘要:
Electrochemical etching tailors topography of a nanocrystalline or amorphous metal or alloy, which may be produced by any method including, by electrochemical deposition. Common etching methods can be used. Topography can be controlled by varying parameters that produce the item or the etching parameters or both. The nanocrystalline article has a surface comprising at least two elements, at least one of which is metal, and one of which is more electrochemically active than the others. The active element has a definite spatial distribution in the workpiece, which bears a predecessor spatial relationship to the specified topography. Etching removes a portion of the active element preferentially, to achieve the specified topography. Control is possible regarding: roughness, color, particularly along a spectrum from silver through grey to black, reflectivity and the presence, distribution and number density of pits and channels, as well as their depth, width, size. Processing parameters that have been correlated in the Ni-W system to topography features include, for both the deposition phase and the etching phase of a nanocrystalline surface: duty cycle, current density, deposition duration, plating chemistry, polarity ratio. The relative influence of the processing parameters can be noted and correlated to establish a relationship between values for processing parameters and degree of topography feature. Control can be established over the topography features. Correlation can be made for any such system that exhibits a definite spatial distribution of an active element that bears a predecessor spatial relationship to a desired topography feature.
摘要:
To enable surface treatment of the inside of a part or the like and also simplify grinding work by equipment and a procedure that are simple in comparison with convention. A first semi-sintered electrode 31 that is formed in a tapered shape whose distal end portion becomes smaller in diameter toward the distal end portion is attached to an electrode supporting tube 26, is configured to be rotatable by a motor 27, is positioned near a seat portion 8 of a nozzle body 1, and generates electrical discharge by surface modifying electrical discharge machining method between the seat portion 8 and the first semi-sintered electrode 31, whereby a coating that is formed as a result of the material that forms the first semi-sintered electrode 31 being moved and deposited can be formed on the seat portion 8 and grinding treatment of the inside of the nozzle body 1 matching the outer diameter of a nozzle needle 2 as has conventionally been the case can be rendered unnecessary.
摘要:
According to the present invention, since the concavo-convex pattern of the embossing form (22) is formed by electrical discharge machining, the peaks on the surface of the resultant embossing form are all of the same level or height, which enables the enhancement of the service life of the embossing form. Further, since the concavo-convex pattern of the embossing form is formed by electrical discharge machining, even a complicated and minute concavo-convex pattern can be formed. Accordingly, when applying the method of the present invention to, for example, the production of a substrate for a lithographic plate, an aluminum substrate for a lithographic plate which excels in plate wear, sensitivity and resistance to stains can be produced. And when applying the same to the production of an aluminum decorative laminate, an aluminum decorative laminate which excel in glossiness and paint adhesion can be produced.
摘要:
Provided is a sputtering target, backing plate or apparatus inside a sputtering device in which an electrical discharge machining mark is formed on the face to which unwanted films during sputtering are deposited, and the electrical discharge machining mark is formed from numerous inclined protrusions having a depression angle of less than 90°. When necessary, chemical etching is further performed to the portions subject to such electrical discharge machining. Thereby, the separation and flying of deposits arising from the face to which unwanted films of the target, backing plate and apparatus inside the sputtering device are deposited can be prevented.
摘要:
A method of making an engine block with coated cylinder bore walls by: (a) casting the engine block (10) of metal (primarily a low cost aluminum alloy such as 319 grade), (b) removing contaminants from the cast cylinder bore walls (11) to provide at least one annular cleansed fresh metal surface, (c) depositing a plasma sprayed coating (12) onto the surface with a powder mixture containing solid lubricant particles that provide a dry coefficient of friction of 0.3 or less, (d) shaping such coating to be concentric about the true axis (14) of said cylinder bore walls (11), and (e) honing the coating to final finish smoothness. Exposing fresh metal (removal of any metal oxide) can be carried out by grit (shot) blasting, electric discharge erosion, mechanical machining of serrations, or by plasma etching. Concentric shaping may be carried out either by rough machining the cylinder bore walls (11) followed by deposition of the thinnest coating that requires only finish honing, or by deposition of a thicker coating followed by rough honing of the coating to concentricity.
摘要:
This invention is directed to a pattern transfer device and assembly for mass-transfer/fabrication of micro-sized features/structures onto the inner diameter (ID) surface of a stent. This new approach is provided by technique of through mask electrical micro-machining. One embodiment discloses an application of electrical micro-machining to the ID of a stent using a customized electrode configured specifically for machining micro-sized features/structures.